Mid-league campaign boss buffs?

I have a fair share of experience with bosses by now. From 0.1 to today I played more as 40 characters to 70+, from which 16 were alone last league.

I for myself try to avoid anything that is either new (unbalanced) or meta and OP.
Since yesterday I was pretty much confident that I saw and know all mechanics from all the bosses in the acts, but either there was an update on them or they were simply just bugged...

So far I saw 3 major differences in boss fights. All of them being in act 4.

1. Benedictus, the first herald, which is located in the excavation area. Always got him to low life 35% before he started spamming the area with weird totem like stones which were charged with lightning, if we touch them with 75% lightning resistance and 1k life, they remove 800 life.

If we dodge roll out of them in the right timing we can avoid the damage, but there are so many of these and you getting bombarded with the next salvo directly again that they either land on you or you just roll directly into the next, which made me literally gave up on the fight.

2. Was Tavokai, not really a problem. There was these weird wales swimming through the air and dropping weird degen fields on the ground. For real, never saw them before :,D

"

3. Solitary Confinement. Prison Boss.
Normally we beat him 3 times to make him staggered, so that we can use the ballistas on him and the third one normally kills him.

He but now got a new phase to the whole fight. I saw his movements and skills in 0.3 I think, already from this phase. Any stuff he does gets this blood themed manner.

The problem but is now. In this phase he doesn't get staggered anymore. Everytime I get him to 75% he just insta heals full again without a possibility to use the ballistas anymore.

Seems like this was a bug. if we freeze him at a certain point were he should go in his staggered phase and me not realizing it in this time, he will constantly recharge life at some point.

Am I going crazy or what is happening? p.P