Nothing in the PBR update can possibly make any difference to the jetway elevation, let alone to KDFW itself, which hasn't changed at all.
OrbX sceneries are known to cause endless problems and, to try to fix them, we added a setting in GSX long ago ( way before the PBR update ) which is the "Ground Elevation" parameter in the scenery customization page, the top right with a small airplane icon. Click that and see if jetways goes back to normal.
However, some of the problems caused by OrbX cannot be fixed this way, and require the airport to be explicitly excluded from their AEC utility, which I don't know if it has finally updated to support sceneries installed using the add-on.xml method.
And, some of the problems caused by OrbX require a specific fix made by OrbX. They have fixes for KLAS, but I have no idea if one for KDFW is available, or even needed.