Guild Wars 2

I fought and beat Poobadoo twice today, with two different guilds ([THIS] & [TTS]), both times contributing substantially to the damage. I received credit & chest on all other bounties today (total 3 guilds), but both times on Poobadoo only, the guild received the favor, but I did NOT receive a chest or a commendation.

Anyone else experience this?

Guild mission rewards are once per week per mission no matter how many times or different guilds you do it with.