So if my One-Handed is 50 and I wear an enchantment fortifying One-Handed by +10, for dagger attacks the One-Handed is still considered 50? Man I hope they get around to fixing the bugs like this in the game. Course being on the PC I'll get the 'unofficial patch' when it comes out.
It's not a bug when that mechanic is working exactly as intended.
Now, you can argue all you want about whether or not you like how it was designed, but calling it a bug is just blatantly false.