It's happened 3-4 times so far. Almost always on skirts, although once was a dress. Knowing it's a bug helps me not get frustrated. ^^ I'm sure it still annoys you, but I hope it helps.
Yeah it's something I thought I had fixed (I tried it out over 200 times to see if it still persisted but I didn't see it anymore), but I guess I was wrong. Sorry about the bug, as I said, just delete the client if you can't finish it. At least it doesn't occur all that often.
My programmer is re-doing the client system now, since we can't seem to replicate the bug.
Thank you for reporting :)