Here is what happened when I don't have anything moving and am using 100 frames. The one corner stays up in the air.

The chair is selected under the add/remove for colision...it's called winger (i didn't name it) adding more frames caused the cloth to start flying away and the simulation fails at 154 frames.  Checking "cloth self collision" doesn't help either.  Any other suggestions?

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I use Poser 13 and win 10