Waveform is longer than actual sound

Hey everyone,

i am getting started with the auto lipsync function. however the waveforms of the audiofiles in the timeline are longer/ stretched to about 120% of the actual sound. the auto lipsync seems to syns to the waveform, so it's completely off and there are still keyframes of mouth-movement after the sound has been played. is this some kind of sampling rate / frame rate issue? i have tried wave, mp3 and aiff. all have the same problem.

thanks 🙂