It is because of this one. I dont really understand your problem, there is nothing like a "pre installed mod". What you are talking about is the usuall version of this model, the one that is in the game from the beginning on. Thats not the one i am talking about. Search for "FS17_Ground_Modification" and delete it in your modfolder.
Thank you, you're right. I solved deleting the mod, i didn't explane me correctly, sorry!
Only another question: in the future (if you want to update the map) can you extend the placeable area? Thanks