I realize since the last update, that by moving a folder, it is split, and that some of the photos are also split.
Please show us screen captures of what you mean by this.
This problem is supplemented by the fact that lightroom does not want to move me some photos sen telling me that they do not exist, when they have not been erased.
Again, screen captures will be helpful. This sounds like a user error where you think the photos are in folder A while Lightroom thinks they are in folder B, most probably because of an error in selecting COPY instead of ADD when you import.