chest bug or not?
The bonus chest is one per day per event per account… doesn’t matter how many times you kill the same “boss” in a day, you’ll only get one bonus chest from it that day.
The big chest though, that’s one per day per event per character… you could run through however many characters you have capable of doing the event to get it multiple times. If you have guildmates who are getting it multiple times on the same character, then they are taking advantage of a bug in some way… that would be using an exploit and very very forbidden.
Thank you so much for answer!