I thought that I'd have a go at fixing things at my end.
I downloaded a GEDCOM, edited it to replace the "Residence" tags with appropriate "Census 1xy1" tags and uploaded as a fresh tree.
The initial person in the tree was fixed - he had Pennsylvania, Missouri and Connecticut on the previous version
So I went to his father. No mention of US places anywhere in the text, but Alaska and Connecticut are still marked on the map!

I've reported it as a problem. I doubt that they will fix anything.