Drops are too weighted.. As a sorcerer, getting only other class drops..

I played on a witch to level 20, got about 20 rares for monk/ranger/warrior..
I play a sorcerer to level 20, I have found about 30 rares for witch/monk/warrior.

In total with 54 rares in my stash - only 2 items have been for a sorcerer, while half of these were found ON a sorcerer. Doesn't make sense. Drops are far to weighted.