.Map :: MoHAA Mapping

Ok...i watched the Mohaa in a Bagel on how to make arches...now i have four pillars in my map...all equal size...i create the arches exactly as the video did...but when i hit Cap>Inverted EndCap...i get 2 small boxes that say Func_Group instead of actually filling in the arches with the endcaps

Any ideas?