[2019] A weapon should not be able to go through a block and NOT hit it

that's not an animation issue, that's a net-related issue. either ping/latency/packet loss/bad server/maybe bad netcode, but this isn't something intended, and the animation has nothing to do with it.

potentially could have been a parry if you were looking more at the weapon in the last part before the attack hit, but that still doesn't explain how your parry went right through in the beginning.