"Move Z axis to zero" button moves plate up, now stuck

[improbablegarage]

I was attempting to reset the Z axis, so loosen the screws and hit the "Move Z axis to zero" button. The build plate moved up a few cm instead of down, confused I hit it again, and again it moved up. I turn the machine off and on, and tried again, and again it moved up, hitting the top of the screw and making the noise of a servo still trying to turn. I hit the down button and nothing happened. 
So down does nothing, up makes the noise of it still trying to go up, and "Move Z axis to zero" *also tries to move up. It is like it forgot what down is. What the heck is happening and how do I fix it? 

Video of the issue in case it helps:
https://youtu.be/nhqJq-Txzow