Focus Duration issue

I need some help to understand why I keep seeing a discrepancy for the Focus Duration between the Remote Player and the Garmin Focus field during my sessions. This is usually in the region of 90 seconds but today was really too much to think there is not an issue.
The Remote player was showing 6:48 and my Garmin Focus field was in the 4:56. Ok, once saved I end up with two sessions (one for the Garmin, one from the EBC app), both with Breakaway Specialist focus (and I delete one) BUT this is really confusing while executing the session!