Sorry about that!
Yes, we are aware of that glitch and will be fixing it along with a few others very shortly. What happened was, you were still clicking on the sign piece when you hit "F" and the game thought you were still moving the sign while in "play mode". It's an easy fix that we overlooked. Thanks for catching that!
Thanks for playing! Based off of how quickly you made it through the demo, I can tell you have played a few puzzle games before ;). Great video!