Were episodes of Daemons of the Shadow Realm review-bombed?

I'm talking about episodes 16, 17, and 18 specifically. Their scores didn't behave like all the others. Usually they get a very high rating until there are 100+ votes, then the weighted mean pushes the score down. But these episodes had a second massive rating drop (each at a different time), it seems unnatural. Especially ep 16: it was bombed from its release: in the beginning it had 7.7 rating and had to climb its way up to 8.1. Even if #17 and #18 are legit, #16 is definitely an odd one out. Also, based on how good and hype this episode is, I feel like it should've been at least 8.4 (comparing to scores of other episodes).