It's bent.
Actually the extension welded to the 5003 Pony clamp jaw is bent. If you look carefully at the jaws, I'm confident you'll find that those long jaws are actually two pieces. Someone has welded extensions to the jaws.
Most likely modified to use as a spreader which is why the one side is bent inwards.
Respectfully, I don't think thats possible! The sliding part of the jaw that's supposed to "fix" against the pipe only "jams" in one direction which is the "clamp" direction. The other direction (---the puller/spreader action) that "fixed" jaw would just slide along the pipe with almost no resistance......