So I had this problem with Pro 19 and upgraded to 20 just to find it causing the same issue. Whenever I drag a video clip onto the timeline it adds about a quarter of a second of extra audio into the clip that isn't in the clip. The program is creating NEW audio inside of files on the timeline. After removing clips, deleting the files it creates when they are imported and dragging them back in, it does it again, but the new sound will be different. I went back and installed 17 and found there was no issue. It's as if the program is pulling audio from the clip and adding extra to the end. Why is it doing this and how do I stop it?
Edit: Pictures added for context. First one is how the clip is supposed to appear when imported to 17. Second is the same clip imported to 20 with the extra audio added by the program.