Crusty skills

My Crusty has leveled up but his skills have not upgraded. Is this a bug or am I doing something wrong? I have included a picture.

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i have the same problem as you.. my crusty level 25 and he didnt learn slash and sewage

Well good new is they fixed the Crusty bug, bad new is my Crusty already leveled past the skill upgrade and now I can't upgrade to them. So still screwed