Report of a bug in Garmin Connect:
I have an Edge 800 and by default the elevation corrections are (and correctly) disabled.
If i manually enable the elevation corrections in an activity (to see for example the difference of elevation gain) and again disable the correction , in REPORTS tab the "Max Elevation Gain" field appears always with elevation correction enabled.
Try to upload one activity of a device with barometric readings, then enable the elevation corrections and again disable then.
Now go to report tab and choose "last 24h" and see the field "max elevation gain". You will notice that that value correspond to the elevation gain related with "correction", when i last choose disable correction.
That's annoying :(. Please fix that bug.
Hope i have helped to improve Garmin Connect
Ricardo