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SW 4.00: Firstbeat Race Predictor & vo2max calculation don't work

yesterday i made a new personal best on a 5k run, the watch himself checked the new pb, so far so good,
but the Firstbeat Race Predictor tells me after my new personal best, that i will run 5k
3 minutes 2secs slower as i already run it yesterday, same for the vo2max calculation, it looks like the value for vo2max
is calculated like the wrong values calculated in Race Predictor.

So what goes wrong, i ever can trust the Firstbeat values on Garmin?

i double checked my vo2max calculation on WKO5 (Training Peaks) and there my vo2max seems realistic, in Garmins Firstbeat
calculation i have a difference of -8, yes 8 difference, wtf?

Training Effect:

Aerob 4.0

Anaerob 2,9

it tells me big change on my vo2max, but vo2max goes down to a value like a untrained with -8!