I've created some custom enemies to fight. GoblinMelee, GoblinBow and GoblinMeleeAggro. I've also created a faction called GoblinFaction and added it to each creature as their faction. I haven't ticked any of the options inside the faction, so no Crime, Vendor, Enemies, or Rank and since I don't know what the tick boxes in General are for I've not ticked any of them?

My faction is infighting, what am I missing?

Under their faction relationships add themselves as an ally.

That should indeed solve it

Thanks. The lesson, never assume a computer has common sense.