I’m just going to throw this out there since I was having the same issue. Not sure if it’s the same problem however but I was frustrated to not find a solution when I Googled the problem.
I work with a lot of external recorded audio from Zooms because I work with a ton of DSLR footage. My sequence settings were at 48KHz while the Zoom audio was 44.1KHz. Once I converted the audio files, I had no more problems.
I hope this helps…
Wendi