Upon enchanting one item at level 30, all enchantments in the table are greatly underpowered for their level cost. Attached visual should explain the issue better:
Environment
1.14.2 Server
Windows 10
Server side statistics unknown
MC-153537
Enchanting table enchantments suddenly awful after single level 30 enchantment
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Well, admittedly that's unsatisfactory, but at least I know why things are the way they are now.