Vehicles disappear in custom game

So I built an infection map on halo 5’s forge.

Basically, the survivors have a few weapons and vehicles to choose from and defend against multiple vehicles storming at them.

Infected start at the other side of the battlefield in a vehicle hangar. There they can choose between Ghosts, Warthogs, Wraiths, AA Wraiths, Gungoose, Banshees, Phaetons and Wasps.
Once they’ve picked a vehicle, they will drive/fly towards the human survivors.

This works fine in Custom Game for the first round, but in the second round a pretty big faction of infected vehicles just don’t spawn at all until the third round begins. Only the Ghosts and two Wraiths spawn.
The third round works fine, but again, in the fourth round a lot of vehicles just don’t spawn at all. This patterns keeps going until the game is over (also with round 6, 8 and 10).

Does anyone know how to fix this? All vehicles have the same settings, also the ones who work just fine. I can’t find anything in the Custom Game options that works.

Try adding a script on round start: spawn (force on) to all the vehicles to ensure they spawn.

If that doesn’t work, I know of some other workarounds but they are much more complicated.

Too many vehicles on the map. delete as many as you can and it’ll fix it. There will only ever be a max of 15 infected in a round anyway, so you don’t need nearly as many vehicles as you have.