BiB choosing lower result

I’ve noticed this for a while, I thought I’d made a post about it but couldn’t see it searching my history so I guess I missed it.

BiB is really keen on my [Pauldrons of Vile Corruption] but when I sim them they are not better:
87,707 DPS
89,016 DPS

It’s only 1.46% behind, so technically within error margin but last time I looked it was more. I assume it’s the Blood Rite trait confusing it.