I have this same problem, and I think I know what causes it.
It is terribly frustrating, I am way behind, like on page 337. It takes a long time to navigate to page 337, and then I often get kicked out to page 1 when I back out of a video.
I believe the problem is when SLR adds a new video to page 1 while you are inside a scene. Adding the new video screws up whatever the arrangement of 12 videos that were displayed before you entered the scene. Then, when you back out of the scene, the app gets confused about which 12 videos were there as thumbnails.
PLEASE PLEASE PLEASE fix this. It used to not work like this. Now it seems new videos get added at all random times during the day, and that screws up the page numbers.