Lag on Heavy Melee Attack

[nicholas.east]

The last few days I've experiencing 1-2 seconds lag time when getting hit by heavy melee attacks. My ping is a steady 49ms in Oceania but I'm getting hit by melee attacks seconds after the attacker is dead and my parries react as if I did them a few seconds earlier, resulting in me getting punched while in a parry or parrying attacks after a whiffed parry.

Edit: Match ID 11052160
I don't know if this is the same issue but at 7:00 my view in game was me, Warden, assuming I had whiffed a parry and watching the opponent fall over stunned for no reason. On watching the replay he walks up to me and gets instantly stunned upon touching me without attacking. I'm not sure what's going on there.