iBooks file problems

I am having problems with a collection of exported ibooks that have all originated from one template. When exporting the ibooks into the ibooks application only one file from that collection is visible. When I try to import one of the files in again it asks me whether I would like to replace it which is very confusing with no file visible. I have deleted the .plist files in the library and restarted but the problem still remains.

Does anyone have any ideas?