Below is part of the log for my last sync which let to a duplication of a run on August 10th (see picture).
2014-08-14 15.27.51 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-06-17-154547.TCX) already exists (409), skipping
2014-08-14 15.27.51 (GMT+02:00) | 2055 | I | The file[2014-06-17-154547.TCX] was processed succesfully with code: 409
2014-08-14 15.27.53 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-06-21-144346.TCX) already exists (409), skipping
2014-08-14 15.27.53 (GMT+02:00) | 2055 | I | The file[2014-06-21-144346.TCX] was processed succesfully with code: 409
2014-08-14 15.27.59 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-06-22-143845.TCX) already exists (409), skipping
2014-08-14 15.27.59 (GMT+02:00) | 2055 | I | The file[2014-06-22-143845.TCX] was processed succesfully with code: 409
2014-08-14 15.28.02 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-06-24-143448.TCX) already exists (409), skipping
2014-08-14 15.28.02 (GMT+02:00) | 2055 | I | The file[2014-06-24-143448.TCX] was processed succesfully with code: 409
2014-08-14 15.28.06 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-06-26-150811.TCX) already exists (409), skipping
2014-08-14 15.28.06 (GMT+02:00) | 2055 | I | The file[2014-06-26-150811.TCX] was processed succesfully with code: 409
2014-08-14 15.28.11 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-06-30-182446.TCX) already exists (409), skipping
2014-08-14 15.28.11 (GMT+02:00) | 2055 | I | The file[2014-06-30-182446.TCX] was processed succesfully with code: 409
2014-08-14 15.28.12 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-01-154312.TCX) already exists (409), skipping
2014-08-14 15.28.12 (GMT+02:00) | 2055 | I | The file[2014-07-01-154312.TCX] was processed succesfully with code: 409
2014-08-14 15.28.20 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-05-123203.TCX) already exists (409), skipping
2014-08-14 15.28.20 (GMT+02:00) | 2055 | I | The file[2014-07-05-123203.TCX] was processed succesfully with code: 409
2014-08-14 15.28.26 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-10-172925.TCX) already exists (409), skipping
2014-08-14 15.28.26 (GMT+02:00) | 2055 | I | The file[2014-07-10-172925.TCX] was processed succesfully with code: 409
2014-08-14 15.28.34 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-13-143652.TCX) already exists (409), skipping
2014-08-14 15.28.34 (GMT+02:00) | 2055 | I | The file[2014-07-13-143652.TCX] was processed succesfully with code: 409
2014-08-14 15.28.39 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-16-171008.TCX) already exists (409), skipping
2014-08-14 15.28.39 (GMT+02:00) | 2055 | I | The file[2014-07-16-171008.TCX] was processed succesfully with code: 409
2014-08-14 15.28.46 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-17-152004.TCX) already exists (409), skipping
2014-08-14 15.28.46 (GMT+02:00) | 2055 | I | The file[2014-07-17-152004.TCX] was processed succesfully with code: 409
2014-08-14 15.28.54 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-20-133427.TCX) already exists (409), skipping
2014-08-14 15.28.54 (GMT+02:00) | 2055 | I | The file[2014-07-20-133427.TCX] was processed succesfully with code: 409
2014-08-14 15.29.00 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-22-164841.TCX) already exists (409), skipping
2014-08-14 15.29.00 (GMT+02:00) | 2055 | I | The file[2014-07-22-164841.TCX] was processed succesfully with code: 409
2014-08-14 15.29.02 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-26-144250.TCX) already exists (409), skipping
2014-08-14 15.29.02 (GMT+02:00) | 2055 | I | The file[2014-07-26-144250.TCX] was processed succesfully with code: 409
2014-08-14 15.29.17 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-27-164300.TCX) already exists (409), skipping
2014-08-14 15.29.17 (GMT+02:00) | 2055 | I | The file[2014-07-27-164300.TCX] was processed succesfully with code: 409
2014-08-14 15.29.21 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-29-184711.TCX) already exists (409), skipping
2014-08-14 15.29.21 (GMT+02:00) | 2055 | I | The file[2014-07-29-184711.TCX] was processed succesfully with code: 409
2014-08-14 15.29.31 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-30-115306.TCX) already exists (202), skipping
2014-08-14 15.29.31 (GMT+02:00) | 2055 | I | The file[2014-07-30-115306.TCX] was processed succesfully with code: 201
2014-08-14 15.29.33 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-07-30-122915.TCX) already exists (409), skipping
2014-08-14 15.29.33 (GMT+02:00) | 2055 | I | The file[2014-07-30-122915.TCX] was processed succesfully with code: 409
2014-08-14 15.29.38 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-01-170501.TCX) already exists (409), skipping
2014-08-14 15.29.38 (GMT+02:00) | 2055 | I | The file[2014-08-01-170501.TCX] was processed succesfully with code: 409
2014-08-14 15.29.51 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-03-081902.TCX) already exists (409), skipping
2014-08-14 15.29.51 (GMT+02:00) | 2055 | I | The file[2014-08-03-081902.TCX] was processed succesfully with code: 409
2014-08-14 15.29.55 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-05-072638.TCX) already exists (409), skipping
2014-08-14 15.29.55 (GMT+02:00) | 2055 | I | The file[2014-08-05-072638.TCX] was processed succesfully with code: 409
2014-08-14 15.30.05 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-07-175247.TCX) already exists (409), skipping
2014-08-14 15.30.05 (GMT+02:00) | 2055 | I | The file[2014-08-07-175247.TCX] was processed succesfully with code: 409
2014-08-14 15.30.07 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-10-150128.TCX) already exists (409), skipping
2014-08-14 15.30.07 (GMT+02:00) | 2055 | I | The file[2014-08-10-150128.TCX] was processed succesfully with code: 409
2014-08-14 15.30.09 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-10-152216.TCX) already exists (202), skipping
2014-08-14 15.30.09 (GMT+02:00) | 2055 | I | The file[2014-08-10-152216.TCX] was processed succesfully with code: 201
2014-08-14 15.30.21 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-10-154316.TCX) already exists (409), skipping
2014-08-14 15.30.21 (GMT+02:00) | 2055 | I | The file[2014-08-10-154316.TCX] was processed succesfully with code: 409
2014-08-14 15.30.22 (GMT+02:00) | 2055 | I | Update Check started for device 3825432902
2014-08-14 15.30.22 (GMT+02:00) | 72087 | I | Update Check Complete: [Update Group for device 3825432902 - MU:0, MR:0, MS:0, CU:0, RF:0, OF:0, LP:0, SR:0]
2014-08-14 15.30.22 (GMT+02:00) | 77451 | I | Cleaned map cache of 0 item(s).
2014-08-14 15.30.26 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-12-171846.TCX) already exists (409), skipping
2014-08-14 15.30.26 (GMT+02:00) | 2055 | I | The file[2014-08-12-171846.TCX] was processed succesfully with code: 409
2014-08-14 15.30.34 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Upload file (2014-08-13-164418.TCX) already exists (409), skipping
2014-08-14 15.30.34 (GMT+02:00) | 2055 | I | The file[2014-08-13-164418.TCX] was processed succesfully with code: 409
2014-08-14 15.30.34 (GMT+02:00) | 2055 | I | Device [3825432902] update with reason: 13
2014-08-14 15.30.34 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Changed to [Succeeded] phase.
2014-08-14 15.30.34 (GMT+02:00) | 2055 | I | [SyncUpload-3825432902] Released sleep lock
2014-08-14 15.30.34 (GMT+02:00) | 2055 | I | Successfully sent sync analytics report
2014-08-14 15.30.38 (GMT+02:00) | 2055 | I | Getting authenticated connect URL for device 3825432902