Guild Wars 2

I put a Superior Sigil of Accuracy on my offhand axe (+5% crit chance) and my overall crit chance on my Hero UI went down by 5%.

Superior Sigil of Earth (60% chance of bleed on crit) is on my mainhand axe.

On Edit: if I switch the weapons so SSOA is on my mainhand and the SSOE is on my offhand my crit chance stays the same, and if I unequip both weapons my crit chance goes up.

Any ideas why?

must be a bug, make a screen shot an report it