Thanks for the advice. I’m going to go try what you said right away and hopefully it will help me along. Most of the footage was shot over a few years with a Nanoflash enabled Sony EX3 but there are also GoPro and some older footage included.
Glen might have a point about mixed frame rates as some of the footage was archival. I will have to go check that out.
Thanks though! Will report back if I manage to solve it.