Using Alucard on S5 Deranged Warrior stages doesn’t steal the dispellable buff from the stage when the passive skill activates.
Chance to steal buff is no longer 100%. It has been cut to 50% so won’t happen all the time anymore. This might be the reason for the issue.
Game Well 
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Related to that, that passive is kind of useless for Ana-belle since she removes all buffs so she’s left with nothing but a 70% damage to all. Kind of wish they would reverse the order, but it is what it is.
It also explains why the defense hasn’t always been stealing my buffs.