How does one determine melee skill caps for Druids?

[Rhoklaw]

I thought all classes had similar melee skill caps for weapons, but apparently that is not the case. Wiki shows 2h blunt for druids does cap early at 175 at level 50 and beyond, but can't find the formula for each level. Reason I'm asking is because my 19 druid has a 2h blunt cap of 77, which just seems odd. Yes, it's capped, because for the past few levels, I noticed it would go up 5 points and then just stop. So for 18, I stopped at 72 and at 17, it was 67. Something doesn't seem right. Should either not be going up 5 points each level or the cap got broken somewhere in the leveling process.