Your object is probably placed far from the origin in Archicad. Move it closer, create a new export file and re-import. You obvious have to drag your object to the correct location in TM because it's origin has moved but that should prevent those art...

@Sculptdesign You could use Design Options to lock your dwg. Create an option ie "DWG" and in Focus Editing select "Edit default only". Relink dwg to this option and you won't be able to select it