Hey I checked your logs and I can tell you whats going on.
1. You did not Deflect anything.
What happened was, that at that time not only one played had the debuff but also 6 other players...which makes it possible that his next Blood Ritual is cast on any of these players. At 3:23 Marak was casting again Blood Ritual, but he did not cast it on you but on one of your Hunters, named Szua. Szua used his deterence and as a result Maraks spell on Szua will be deflected. Warcraftlogs is Analyzing this from Maraks point of view, he casts it...and the spell got deflected. You were just staying there...you were not the target...you were just getting the aoe damage from it. As a result there is written that you deflected the spell, which is not true...it just got logged because Szua was the initial target and he deflected. You can also see this in the replay.
I recommend you guys not to have everyone in your debuffed by that