onyxia unholy dk spec scourge strike improved bug

hello,

i have a bug on my char about the critical strike of scourge strike.

with all my talent and my char critical strike details , i have around 50% crit strike rate, but actualy in raid i have 15% less on recount

it s very strange
spec 15/1/55 char immodk
regards

immo

character crit = 33.18 +9% by talent subversion = 42.18% on scourge strike

other try on dummy selfbuff: 10 min try
only 27.6% crit on scourge strike

around 15% less crit than he have to do