Guild Wars 2

I happen to find this bug when I had a sigil of corruption on my axe and a sigil of bloodlust on my longbow. Upon log on, the first buff I receive would always stick to my character until log off, regardless of what weapon I am using. So, If I started using axe to kill a mob, that corruption buff would always stay even if I switch to longbow. Even kill something with my longbow, I can never stack any bloodlust until I relog to reset the buff. The buff from sigil needs to switch when you switch your weapon.

Not a bug, in fact most classes should swap weapons often in combat, whihc would make stack sigils useless if that would make the stacks disappear

You are missing the point.
I am expecting to get the stack from that specific weapon to be effective when you switch to that weapon. For example, if I have +5 stacks on my axe for corruption, when I switch to longbow, I still can receive +7 stacks of bloodlust for killing 7 mobs with my longbow while the corruption stack is absent. Then when I switch back to axe, I would get my +5 stacks of corruption back and my +7 stacks of bloodlust from longbow absent until I use longbow again. My longbow is for direct damage and axe for condition damage, which fits both weapons just fine and it should work that way.

No way you can suggest that an MMO game in 2012 cannot remember what buff and how many stacks stayed on that weapon while being switched.

Or maybe you are missing the point, as a staff +scepter/diffenret offhands mesmer, i have a corruption sigil on my staff, i do NOT want to loose my corruption stacks becasue i swap to my scepter, since that is the way i can do a big stack of confusions, so want as much effect from those as possible, so yeah either you please the type of gameplay you do, or the type i play, and well unfortunatly for you, it works the way that support my playstyle.

So yeah working as intended

I’m going to have to agree with GummiBear here. I know several people who build stacks on weapon and then change it out with another weapon with a different sigil, to reap the benefits of both sigils. For example – 25 stacks of bloodlust then switch to a weapon with 5% dmg. It’s pretty effective.

Also, stacks reset on changing zones/instances.