Help! Animating hogs my Pos Y.

The distilled problem in my project can be downloaded here.

If you mouse-over the UI object, another UI object animates out from underneath. If you then attempt to click and drag the revealed GameObject, it won't move along the Y axis. Since the previous animation only moved the GameObject along the Y Axis, I think it's safe to say that the previous animation is blocking changing the Rect Transform's Pos Y value.

Am I doing something wrong? Do I need to do something to release my Pos Y?