Are your Booknumber, Chapter, and Figure field drop-down lists the real fields in the table?
It sounds like they are. When you change Booknumber from 2 to 1 and it is then changing the table value you are editing the data.
Seems like the drop-down list fields should be separate global fields used to process the selection and not used for updating the table as it sounds like you are looking for a display action not a data change action.
Thanks. That's what happened.