I've got some problems with my new map project. Just noticed that I added abandoned 3 Mgs and mortar in the middle of the map by accident, and want to remove them. But.. i can't even select them! Tried using many methods, and tools without effect, selection tool and obj. placement tool, doesn't work... is there any way to delete them?

Link to the map
PS
ofc. restarting WB doesn't work... just for sure...