Occlusion of Sound bard mr/fr/cr debuff not taking hold

[Coffee]

How is this a bug?

I'm guessing that the resist mods are in the same slot and since the + of summer > than the - of oos, that's why.

On the other side of the spectrum with malosini and bobbing corpse or resist fire for example the + of the buffs are < the - of the debuff therefor the debuff overwrites.