Feature Display Issue with Explorer after Solids Modification

I refined the pier cap for the hammerhead on the right using solids modifying tools, and kept the one on the left as unmodified. When I go into Explorer and turn off all supports, the modified cap stays visible, while the column and foundation connected to it are hidden. It's almost like OBM doesn't recognize it as a "support" anymore because it has been modified by general 3D modeling tools. How can I remedy this issue?

TIA,

Adam