Hmm, kind of thought I was the only one. Used 400 stamina and got 6, combine this with the plunder convoy bug and I'm not having the best day in Naruto today. I obviously can't say for certain if there is anything wrong, but maybe look into it. I don't mind spending coupons to get extra keys, but not even being able to get the 10 is a real bummer for a player trying to make the most of his resources in this game.

Thank you for checking Narbsy, still it's a real bummer to not hit that 10 with decent levels of stam. Server 55:Asuma here.