Your twitch "video" is just your live stream, not a link to the recording. We can't see what happened.

First of all , turn off your caps . It never helps .

I am writing this after I wrote everything below . I am guessing your main is not a tank . You feel the resource drain bug a lot because you don't take advantage of being a DK . I watched maybe 5-10 minutes and seen at least a couple times you running out of Stamina and waiting for a potion instead of spending your Magicka which is full . Especially on an Argonian DK tank , you can completely get around the resource drain bug with a little bit of L2P

I play the game at least 3-4 hours each day on my tank for years and never seen chains and taunts not working .

Chains mostly don't work because target is CC immune . Sometimes the chain will proc the Burning Status effect and it will stun enemies that have weakness to Flame damage , giving them CC immunity and making them unchainable .

If taunt doesn't work , that means target is being overtaunted . Taunts always work or I was extremely lucky for about 3 years of my tanking in ESO .

At 45:00 , you have a cushion on the ground between you and the boss . That actually counts as some kind of wall and boss will ignore you and cast the Negate somewhere else . Yes , I know it is stupid but it always worked like this so better get used to it .

At 59:26 , boss is looking at the group . You should have got out of Negate faster with a roll dodge and turned the boss to the wall . As long as boss has people in his point of view , he will cast it on them , furthest one if they are in range .

What you should do to avoid these two problems is just keeping the boss closer to middle . This way you will have easier time chaining black adds as they are more likely to be in range .

About range negates , read what I said about 59:26 .

I don't see any false negates . I can clearly see the previous negate disappearing and a new one appears at the corner of your screen . Why ? Because your team member is running from there .

Everything above is just mistakes , nothing to do with game .

Now the real bug is keeping the colours after boss is dead . Well , that happens time to time . Best way to avoid is actually watching boss' health and trying to kill at the same time and/or not running into a bunch of white colour allies while your head is glowing black .

ESO is a buggy game , I suggest you get used to it instead of raging like this and try to give proper bug reports in the correct forum : https://forums.elderscrollsonline.com/en/categories/bug-reports