Issue with UI Animating

I was animating a UI button in a pause menu so that when the mouse hovers over it, it Scales up. However, when I click on the button (A resume button) and open up the pause menu again, the button hasn’t completely returned to it’s original state. How can I fix this?

Problem at hand:

Do you use mecanim to animate it ?

No, I guess I didn’t think using State Machines would be too useful. Would using mecanim help eliminate the problems I’ve been having, perhaps?