Why am I getting magnetic effects from cloth objects? Using the current Blender version, 2.8 RC2. This setup was according to another posting I followed to learn how to create curtains and get a pulled back/curtain ring effect.

For the most part it works as designed; however instead of just cinching the curtains, the torus attracts them. Eventually the curtains get all wrapped around the thing. Magnetic forces are not turned on for anything. 

I can't find anything else that would cause one object to be pulled in to the other. A little help please.

 

Original post, with Blender file I downloaded, is here:

How to make a curtain
What appeared to be the issue is the "Single Sided" option in Collision settings. Somewhere along the way I unchecked that, which made the cloth try and wrap around the ring. It's confusing since it looks magnetic, which can be set elsewhere.