When I see a tire bead sitting high at moderate pressures the last thing ai will do is double the pressure w/o further understanding or look see done.

Not being there I can't say what went on by who but a real common reason for a tire bead to sit too high in a spot is from the tube being caught under the bead. Often simple deflation and minor tire/rim manipulation then reinflation will correct this. To an inexperienced eye watching a pro handle the wheel might not seem like a "repair". BTW was that portion of the bead that wasn't seating properly also right at the valve?

Another seemingly minor difference between using a floor pump and a compressor is how the wheel/tire is being supported. With a floor pump the wheel is generally placed on the floor and the pump's chuck attached. then the pumping is started. With very flexible or loose fitting tires the mere weight of the wheel will push the bottom of the tire deeper into the rim and the top of the tire might also be raised out of the rim a bit. With a compressor the wheel is often hand held while the air chuck is applied. One can also manipulate the tire and valve with the holding hand to keep the valve from being pushed into the rim. This manipulation can help both the valve standing proud enough for the chuck and feel for the valve base being fully "above" the tire's beads. Again this handling while using the compressor can be hard to note if one doesn't know what to look for.

Of course there's always asking the person who just inflated the tire with good tire seating. Did you ask them? Andy