When I try to assign points, like 30 for example, sometimes it won't let me assign them. It says something like invalid amount, or that I exceeded the amount of cp I was allowed to give, when I just tried to give 30.

Sometimes I find this happens to me if I try to assign, say, 30 points to a wolf that already has 180 CP in that area - it would exceed the amount possible. However, I can't say if it's a bug or not, I don't pay super close attention lol.