Recording Theater Mode Using a Cap Card

For quick context, I have been trying to edit a video where i have my gameplay (recorded using a cap card) as the main focus and having a smaller video (about 5 feeds being switched around, all having been recorded from theater mode) and i have been attempting to sync them all together to no avail. The feeds from theater mode all stay synced but they drift out of sync with the my gameplay that i recorded at the time with the capture card. If they drifted a few seconds out of sync, then that would be fine but nearer the end of the video, they’re way out of sync by nearly a minute. Is there something about theater mode that im unaware of that causes this issue? or do any other video editors have any idea as to what may be happening? I’m sorry if this forum is the wrong place to be posting it, but i figured that the halo community would probably know more about theater mode than someone on a random video editing forum. Thank you

Thats definitely an external issue.

cheers, ill keep fiddling with it. I thought id would be worth an ask. I know that theater mode is awful in H5, it wouldnt have surprised me if there was something in theater that was causing it.