Raid Fervor not increasing as it should consistenly

This is Nightmare raids
I have 13 Role Force charges for assault and I am using Sentinel vs Weapon X
Raid Buff chosen : DOT boost.
Intercept and gain debilitate charges. Each debilitate or each damaging effect should increase the Raid fervor I get.
I have light intercepted 3 times to gain the max 5 debilitate charges on Weapon X and I am completing all the prompts for Thanos Sayeth, I can confirm I am completing the missions but the fervor just increases by 6 instead of increasing by 6x5 (debilitate charges)
This does not happen consistenly, once I spent half of the fight reaching to 50 Raid fervor but the next 2 fights, I got to 50 within 2-3 missions being completed as it should be.
Is there some interaction I am missing here ? Otherwise this looks like a bug which I have noticed few times before but never been fixed.
I have 13 Role Force charges for assault and I am using Sentinel vs Weapon X
Raid Buff chosen : DOT boost.
Intercept and gain debilitate charges. Each debilitate or each damaging effect should increase the Raid fervor I get.
I have light intercepted 3 times to gain the max 5 debilitate charges on Weapon X and I am completing all the prompts for Thanos Sayeth, I can confirm I am completing the missions but the fervor just increases by 6 instead of increasing by 6x5 (debilitate charges)
This does not happen consistenly, once I spent half of the fight reaching to 50 Raid fervor but the next 2 fights, I got to 50 within 2-3 missions being completed as it should be.
Is there some interaction I am missing here ? Otherwise this looks like a bug which I have noticed few times before but never been fixed.
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Comments
It’s super annoying because I’m doing no damage every run through
This bug has been there since a long time. It was way too infrequent in the normal raids for it to matter but in nightmare raids this happened to me like 3 times out of 6.
Its gonna be complicated idk whats influencing or preventing the fervor from increasing as it should.