I don't know if this is a known issue or not but there's an issue with Iruka's shield passive. He puts his shield up normally but when he raises the stats of your Konoha ninjas somehow the shield gets removed from everyone but him. It doesn't always occur, it appears to be completely random since with the same exact team, and no alterations like moving people around or moving someone out of the party and then put them back in again, at the same exact instance (team Instance level 60) it worked fine for 2 rounds and bugged for the next 2. Consecutive runs, no alterations in my team, no alteration in our player party, no nothing.