You could try checking if you need to update any audio drivers on your computer. I had a somewhat similar issue on my wife's Mac where the audio was recorded at 48kHz, but the driver always defaulted back to 44kHz output even when I would manually set it to 48kHz. An audio driver update resolved that issue; but that audio distortion was in every program (not just RaceRender).
Another possibility is that the video is being encoded in H.265 which RaceRender does not currently seem to handle very well. Perhaps advice from this post would help:
https://forum.hptuners.com/showthrea...ered-correctly
Exporting it to H.264 from a different video editing software prior to importing it into RaceRender works well for me, but I'm also not trying to use any GPS data stored in my videos.