Forge created map unplayable in custom game?

I recently created a map on halo 2 anniversary forge but when I go to actually play on it in custom game with other people (splitscreen, local) it has them or me as a spectator and only one person who actually spawns (but playing as me). On the start menu before we begin the game it shows everybody signed in in the party. It doesn’t do this on any of the standard maps, only the ones I forged, has anybody encountered this issue and does anyone know how to fix it? It’s rather pointless to forge or have a forge if you can’t actually play on it.