Animation gets distorted when using Additive Layer

Hi All,

I'm working on an FPS Mecanim system and I'm currently facing a problem with additive layers.

I'm using an additive layer for controlling the Vertical Look of the player. Values from -90 to 90 are sent to the animator to control which way the character will look. I have 5 animations containing 2 frames each, Start Pose (facing Front) and Additive one(Facing -90, -45, 0, 45, 90 degrees).




As I trigger any animations from the base layer (Run, Reload, Fire, Aim, etc.), I'm seeing a weird behaviors for each animations. The bones doesn't seem to react properly to the additive layer. It starts without any effect at 0 Degree and it get distorted as I go to 90 or -90 degrees




Anyone has an idea?

Thank you