If you shot on dedicated hardware then you likely would be getting a standard framerate from that. Whatever you picked in your camera settings it should stay like that, so that'd be unlikely that it had anything to do with it.
You did mention multiple containers, though, so is there other footage coming from something like a phone?
Also, regardless, you can confirm this issue by looking at the framerate of the sequence. Is is a standard framerate? If it's not you can change the framerate to the nearest standard framerate. Like, if you had a phone clip with an FPS of 28.99 or something wonky like that, then maybe 29.97 or 30 is the FPS you'd want to choose for your sequence. Whatever the intended framerate was.