You can’t put 29.97fps footage on a 25fps sequence without interpreting it to 25 as you will have this problem. It’s skipping frames to play at 25. In fcp you would have had to use cinema tools but in premiere you can right click source footage select interpret footage and choose 25fps. I’m confused as to why no one has noticed this before, what was your workflow previously?
Chris Gunningham
Online/VFX Editor