Algodoo

I was just starting to build a ringworld in Phun, and I was trying to figure out how to set the spin equivalent to Earth`s gravity when this really awful bug showed itself. The G-meter I built onto the inner surface of the ring is supposed to have the bottom of the white block match up with the bottoms of the blue blocks under one G, but it oscillates depending on the angle it`s at as it spins.
I tried to set it so that it indicates normal earth gravity at the bottom of the spin, where it`s at the same angle as it was when I calibrated it under normal gravity.

What the hell is going on here?

P.S. I think this has something to do with how Raunits work.