Animation Blending Problem..

My Character moves as expected and when the transition from the standing animation to the walking animation occurs, everything works smooth. But, when the opposite occurs ( from walking to standing animation ), there is a slight bump toward the transform.up, which isn't super noticeable until the transition occurs several times at which point the character is floating in space and continues to go higher every transition. I'm hoping to not have to make a fix by code because I'm sure there is a simple explanation for this and I want to understand mechanim better anyhow, so hopefully someone can shed some light.

Thanks in advance for the help!

EDIT: I checked my 2 different states ( walking and standing ) in blender and they always share the exact same transform.up position.