That thing also happened to me, but the gap between them is long .. I got my first Hashirama last Sept10, and got my second on Feb5 .. I skillbreak his Ninja God so his buff will last forever then i managed to get another 20 or 25 fragments from the Ninja Bonds in Home Interface and skillbreak his Giant Tree Breaker so that in case that i'm gonna use him in fights, his combo can deal debuff .. now i'm sitting with excess 5 frags and waiting for another Hashirama drop and maybe make him 4star or go skillbreak his skills to max ..

Yeah, maybe since Hashirama has been on the Events last cycles, he already showed up in Konoha Great Tree and other events like Spending/Recharge Rebate ..So they stopped and changed the prizes in Mission Boxes to give break for Hashirama cycle ..