Audio shorter than video after import

Hello Community,

Thanks in advance for your help and any tipps you may have for me.

I have a .mp4 file with variable frame rate that runs fine on Quicktime and Vlc. After importing it to premiere and embedding it in a sequence (no matter what fps i set it to) the whole thing gets out of sync and the audio drifts. It seems like, the audio is being compressed into a smaller time frame, while the video stays the same. To make this more clear: The .mp4 is a podcast episode, where the speaker says "goodbye" on the waveform 7 minutes before the video ends???? I've experienced similar before, but usually its the video that is shorter than audio, so I really don't know what to do at this point. 

Things I've already tried:

- exporting it on different codecs and fps through Media Encoder

- Handbrake CFR,  FFmpeg CFR, other editing application

- premiere on windows & versions of Premiere

- screen recording it with OBS and import it again

The overall solution must be simple, because I can't wrap my head around how I still have the same problem after trying all these things, and especially the screen-recording. If you have any idea, please let me know 🙂

Thank you very much!