We have discovered a bug in PhotoMechanic, which will write GPS values with a low precision to the XMP metadata. This can cause NeoFinder to show a slightly wrong GPS coordinate as well when cataloging photos.
If you see this problem, either use NeoFinder itself for more precise GPS geotagging with a much nicer map, or ask us for a development version of NeoFinder with a workaround for that bug in PhotoMechanic.