Guild Wars 2

Hi everyone, i wuold to ask you something about boss chest missing.
When i defeat a boss i can’t get the final chest often, for example yesterday i’ve done the “triple truoble” event, defeated the wurm, “tequatl” and the “shatterer” and none of them gave me the chest, why? Thank you

The big chest (the one on the ground) once per day per account. If you’ve done the event before on that day on another character, it won’t appear a second time. If that isn’t the case there have been times when it bugs out.