Mine doesn't, and I have 1 custom unit in my map. (Made by simply changing the flying height of one unit to -8, the editor auto-duplicated and did the rest.)
Mine is also the same as the kirby guy; im guessing its because your map is still considered a melee map and not a custom as you didnt add any custom stuff yet
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.