Best cat-rearing advice I ever received: Cats are gonna cat.
You can try to fight their instinctive behavior all you want, but you’ll lose every time. What you’re describing is common dominance behavior between cats and not at all pathological. Just stop doling out attention when they beef, and throw them a treat if they’re hanging out amicably for a while.
You can channel a river, but you can’t dam it entirely and expect to win forever.
