I am sure it is supposed to work that way by design. I suspect though that the tilt sensor is updating more frequently than well… never (until its moved) and that is why it starts working. The position becomes “known” and it will allow normal function to resume.
I have no idea why mine works and others do not? From what I had read and even from the instructions that came with it, this unit is made by Linear.
If anyone wants to compare notes about production date info if we can find such stamps I am willing. Technically I bought it from eBay but it is branded iris on the box and unit.