If you place carpets between an enchanting table and bookshelf blocks, the bookshelves will have no effect on the enchanting level. Removing the carpets and using regular wool blocks as floor fixes this issue.
MC-73020
Carpets cause enchanting tables to ignore bookshelves
Resolved
Duplicate
0
Dragonmcmx
(Unassigned)
Unconfirmed
Minecraft 1.8
Retrieved
Works As Intended