In the latest version putting, 15 bookshelf's around an enchantment table won't make a level 30 enchant when you put for example a diamond pickaxe in.
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I can see at least one button that blocks at least one bookshelf, see if removing it fixes the issue.
Duplicate of MC-2474
It's hard to tell from that image. There must be exactly one block of air between the enchantment table and each bookshelf. No other objects like water or glass can be in between