Hi @aaron
you may try to use FreeCAD sketcher to fix it.
In StepUp WB there is a ‘constrainator’ utility to fix non coincident pcb edge points…
Also the Sketcher has a validate utility to fix not coincident points.
You can pull your board in FC with StepUp, fix the pcb Sketch and Pull it back to your board.
This should fix your pcb edge.
(you should add a grid origin to your board and configure StepUp to use it, before align pcb and sketcher)