Mecanim Animation curves not working as expected

I have an animation with a curve applied to it that goes from 0 at the beginning to 1 at the end of the animation. But for some reason when the value in code gets to around 0.7 it will start counting back down to 0.

I considered that maybe it is during the transition to the next animation that this is happening. If so, is their any way to stop the transition from messing with the value? And if not is their anything that is known to affect a curve's value?