Audio starting at different point after exporting video

When I export, the audio file I have overlapping the video file starts at the same point in the video, but it does not start at the beginning of the actual audio. When I listen to it in Shotcuts timeline it sounds perfect. Thanks for your help sorry I couldn’t figure it out!

Maybe it has some problem to seek reliably on this file. What is the file format and codec of the audio file?

I ended up converting the file from .m4a to .mp3 and it worked perfectly. Thanks!