fence gate makes noises but doesn't move.

I had a fence gate on a pressure plate and while standing on the pressure plate and right clicking on the fence gate it played the open/ close sound but the fence gate itself didn't move. it also acts as if its closed once I'm of the pressure plate but looks open.
I have attached a video to show it and I have no idea how to stop it flashing but hopefully its clear enough for you to see what's happening.