Guild Wars 2

I notice that my burns leave prematurely at certain times…

Purging Flames
Burning (8 3/4s)

Judge’s Intervention
Burning (5 1/4s)

Virtue of Justice
Burning (7s)

I get a total of 20 seconds on a dummy which is about right… but when I’m dueling my burn removes at around 11s. I saw it happened when I was trolling/testing it on a warrior. I went on spectate mode and saw that he had no passive condition removal skills and his traits looked fine…. same thing happened when I was dueling a mesmer in a previous game. It was like, the utmost bottom burn stack ended, so did the top stack, which isn’t suppose to happen?

Buff-Food with -condi duration on them?

This was in the mists so, unlikely. If it was -condition duration, instead of 20 seconds it would have been 15s or whatever, not completely removing a full 11s burn.