copying frames from one layer to another

Yo. Toon Boom dummy, here. Everytime I copy a sequence of frames and then paste them again into their own layer, everything goes fine. But if I try to paste them into a different drawing layer, I get a fraction of the frames I was trying to paste, and they seem to be out of sequence, and it’s just a big mess. Does anyone have any insight into this problem?

Normally this should be working. Maybe you are copying too many frames at one time and you’re running low on memory.