I noticed this bug before GCM 2.0 and it remains on latest GCM 2.01. On the GC website, under "Workouts," I created custom workouts w different pace ranges within Warm-up/Interval/etc, but they're shown incorrectly on GCM 2.01:
Garmin website >>> Android App (GCM 2.01)
18:15 - 14:15 >>> 18:14 - 8:51
11:15 - 11:15 >>> 11:14 - 6:59
10:15 - 10:15 >>> 10:14 - 6:22
09:15 - 09:15 >>> 09:14 - 5:44
Please fix, as this makes Workouts completely unusable on GCM app.