Guild Wars 2

This is the one that gives +10 precision per kill and ends on down.

It resets itself when I move between areas. Is this a bug?

All of the sigil’s that provide stacks have done that for me.

Perception (Currently use), Luck, and Demon Summoning for sure.

All of them function the same as far as I am aware.

They all reset on down and area change, the former is self explanatory due to the way being downed works (food items used to reset too). The latter IMO is more of an anti exploit mechanism designed to keep players from kacking low level critters in say Queensdale and then going to Orr pre-buffed.