Whenever I try to mod something it all goes well and looks good in the construction set but when I save and exit the construction set I think something goes wrong. For some reason when I re open the construction set and load my mod there's an object with the same EditorID of what I modded except it has "DUPLICATE" after it and none of the changes occurred to whatever I tried to mod, but instead to the unused duplicate. It's happened when I was trying to change the mesh of a creature or when I placed objects in a cell. I don't understand why this is happening or how to stop it because it happens after I save the mod.