Found a bug where if you have no cartridge loaded and you are in melee if the reload and attack button are bound to the same key (left mouse for instance) after a few swings it will auto switch back to Rifle mode and try to reload. This can result in your character being stuck in the prepare to thrust for melee and never getting out of it. Hitting the attack button again does nothing. Manually switching stances will break you of it but in the middle of combat it's a bit of an issue.
Has no bearing when the keys are bound differently (left and right mouse button for instance) or if your rifle is loaded.