Yeah, especially Allegheny. I'm wondering if there was some type of voter roll adjustments since 2022 as well; it's hard to square a lot of this, but especially Allegheny gaining like 16K republicans when that county is zooming left.
Allegheny has a very weird voting history as one of the few educated areas in Appalachia. Not too many counties that were as strong for McCain as Bush also swung left from 2012 to 2016 and from 2016 to 2020. I'm guessing there's still more ancestral Dems to be shed by Democrats than former Republicans to be gained, but nowadays people also choose to be unaffiliated more. That's independent of the voting trends, where Democrats are definitely outpacing registration changes in the educated north hills.