I have the same problem using workouts including MMP.
For example 4x8m works perfect when used like this:
Main 4x
- 8m 95% MMP 8m
- 4m 40% FTP
I end up with 309W on the Garmin which is the same in the workout builder. But when I try for warm-up:
Warmup 2x
- 30s 90% MMP 8m
- 2m 60% FTP
The 30s burst should be at 293W according to workout builder, but on the Garmin itself it’s 563W. I thought it might take the 30s interval from the 30s MMP and not the 8min one, but the workout builder shows the watts as intended, only on the Garmin device it’s off.
