Lightroom Classic: Video (dl from instagram stories) playing at normal speed but audio is half speed

Can you help me?

I'm using lightroom classic to organise photos and videos from a trip. I have a number of videos from my phone, which work and play back is as expected. However, I have just imported some videos that I have downloaded from my instagram stories, and for some reason, in Lightroom Classic only (i've tried in Preview and no issues), the video playback is normal speed, but the audio is half speed. I have deleted and re-imported these video files a number of times, but to no avail.

Anyone had this issue or know how to fix it?

Thank you!