I logged on today to complete my daily pvp assignment and my normal daily assignment. I completed my normal one first and then went to the arena to get my pvp assignment, only to find that it said I had already completed it and needed to come back tomorrow! I checked my reward list and it said it had given me the day two prize (I never got it though). The first day I had completed my pvp assignment before the normal one and had no issues. Completing your normal assignment first gives you credit for completing both assignments that day (although you don't get the pvp reward). I can at least do the pvp assignment first every time, but this bug should really be fixed before someone loses a bigger prize like the five day chest.