I had a Geissele S3G trigger that would routinely double if I was shooting from awkward positions. It wasn't a trigger malfunction, it was just that the trigger lent itself to bump firing.
Yeah, well try to get that distinction without a difference to fly with the cops. Oh! Wait!! lol
Actually good to know. That may be why one of mine is doubling, too. I'll have to see if it has the S3G in it. One does.