Ornn's damage on W and Brittle'd autoattacks in jungle

I've been playing Ornn jungle and I've seen that W damage doesn't apply properly and is doing much less damage than it should (or I'm missing something that talks about monsters, because I've found myself unable to read anything regarding to this) and that autoattacks on Brittle'd targets (Blue and Red, at least) did the same damage than the total of my W. I have no idea about champions because I didn't pay attention in the fervor of the battle. Have someone else noticed something about this? Am I not reading some text that explains this?
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