very interesting

Good night; I am a licensed user of Adobe Premiere Pro. I am currently facing a problem that will drive me crazy. I do many days of event shooting with my Sony professional camera. As you know, I combine the piece by piece images in Premiere Pro and make the montage. In every organization, not in all of them, there is a section where I shoot the video as a single piece with a tripod and when I upload this section to the computer, there is no problem. However, when I upload it to Premiere Pro, only that part of the video starts again at the exact middle and the sound and the image move forward in a different way. There is no problem in other parts of the video. The fact that the same problem occurs only in that part of the video in all organizations where that episode is shown is very interesting. That part that causes problems in the premiere normally plays without any problems on the computer and I don't know what to do, I've been going crazy for weeks. If you could help me urgently, I would be very grateful.