Guild Wars 2

I have Superior Sigil of Fire (Tigger’s Flame Burst AoE 30% chance on crit ) on my Molten Axe (main hand ) And my off hand I have Malefacterym with the default Superior Sigil of Blood ( 30% chance on crit to steal health).

1)Do these Mess each other up? Or does my off hand sigil not work because i notice the Sigil of fire AoE burst happen but sense I’m a life stealing necro I cant really tell if my dagger sigil works.
2) If so what Should I replace my dagger sigil with? ( no stack sigils I use luck on my staff )

1) They do not mess up…
2) see above……

To explain however a bit more in detail. All attacks in GW2 uses a skill (the 5 weapon skills). The first three skills are tight to your mainhand weapon and the last two to your offhand weapon. When using skill 1,2 and 3 the stats of the mainhand weapon are active. When using skill 4 and 5 the stats of the offhand weapon are active.