I tried to make guards fight using mob battle mod by assigning them to different teams but they end up attacking their own teammates when they see an enemy guard

Can't recreate on an instance with only the mob battle mod and guard villagers mod. Could you try removing any ai-related mod and see if that fixes the problem (ie; ai improvements)

ok I will test it again but it usually happened with large teams

I'm gonna keep it real with you. It's been over a month since a message was last posted here and no other tests have been conducted so far. If another test shows that this bug still happens I will investigate further, but I will have to close this for now since this is a month old and I don't want this issue page being filled with old reports all the time.