My pockets have pockets

My pocket diapers have started leaking. I have stripped them and it doesn't seem to help. My baby used to wear a pocket diaper at night but I finally got tired of changing outfits and sheets in the middle of the night so we are using prefolds full time. Any ideas on what might be causing the leaking? It seems to happen right after she gets a new diaper on and she is laying on her back in bed. I know I should still be trying to use them to figure out the cause of the leaks, but I thought I would ask here instead.