Can anyone say FMB BUG
An unselect option is pretty fundemental to the fmb functionality, but not fixed/implimented
12 months after the game has been released. Still it's much more important for the dev's to move on to developing BOM that actually fixing cod isn't it
What I do is to paste a saved group of objects onto the map (that unselects the first group of objects) then I swipe the newly pasted group & delete them.