When an article is added to the Main Menu, The second column of submenu items disappears (where there are two columns only). This happens with both the SERVICES and SUPPORT US main menu sections on the pet adoption website.
In the Menu area of Gantry, all of the second column items revert back to the first (left) column.
To restore the missing submenu items, delete the article and the menu item and the second column of submenu items returns and the Gantry Menu returns to normal.