Animation layer only blends with idle problem

Hi everyone. I have an animation layer for attack animations, and I use an AvatarMask, that masks out the lower body. When I don't activate animation triggers in the top layer all my run, move, jump, idle etc. works fine. When I have an top layer (with loop) selected, it only blends with the idle anim. I use the Unity third person controller from the standard assets pack.

My top layer settings are Weight 1, Override and IK pass.

Anyone experienced this before?

Thanks in advance

Odin