To clear up: Since the removement of reading list the library-folder is quiet. I didnt have that changes of the .opf before. The reading list was created last week, i told that i think the changes were done by creating the list. After the first creation of that list i added books and didnt add them to the reading list, everything was quiet. But at teh moment i added 2 books to the reading list, everything began changing again.
I dont have Full text search option activated, so thats not the cause. Full text search is activated with another library, there nothing was added or removed.
I cant tell what was changed at the .opf, i didnt look before and after in this files.