Dumb question I know but you do own the land correct?
Viewing post in FS25 Judith Plains, Montana 4X comments
Definitely strange man but it has to be a mod conflict somewhere. Hope fully you use FSG ModAssist? Create a folder for testing in there with only a few "necessary" mods like easydev, store deliveries, etc... throw in something easy like Wampsville DIY map to use when it's not a map issue and then obviously Judith Plaines and try it.