In the Levels skill purchasing menu, buttons will be displaced if some abilities are disabled.

In this screenshot I have B:soulBoundArmorAbility=false set to false on the server's side, all other abilities are set to true.

Forge 13.20.0.2252
Levels 2 R1.2.0
Minecraft 1.11.2

Hmm...that shouldn't necessarily happen. I'll look into it though.

Fixed in r1.2.1