Version 2.1.2e and 2.1.3j

There are many bugs with the Barbarian and Bloodrager class:
1) If my character has a bite attack (Kitsune or thiefling, for example with a 1d6 die), when selecting the snake lineage (which gives a 1d8 bite attack), when he goes into rage he doesn't add the extra attack of bite, there is only one.

2) Something similar happens with when I select Abyssal at level 1 of the mythic path, which gives a horn attack, and then I select the lesser fiend totem (Which gives a horn attack), I only have a horn attack when raging (I have turned the horn attack on and off, both before and during the fight, but it hasn't changed, I always end up with a single horn attack)

3) Killing stance doesn't work, it's identical to stun hits, the first one adds bonus to attack and the other adds bonus to damage. When activating the second one you can see that the damage increases, but with the Lethal Stance nothing happens, I have also been able to verify this in the combat log, the attack bonus is never added.

I'm not sure. I don't fully understand Pathfinder rules. I'm playing a Barbarian -> Instinctual Warrior and don't have much in the way of natural attacks. It could be a bug or maybe there's some rule about mixing natural attacks and melee attacks that you are not taking into account.

As for Lethal Stance you may be right. I don't notice it being included in the battle log as a modifier.

You can submit bug reports in game with ALT+B

Thanks!!!