Treasure Fleet Glitch

Hey guys, today I was doing a few treasure fleets with guild mates, and we noticed something huge. Every fleet ship we sank, we got a skull chest. We believe it's a glitch, but it has not been proven. I hope they never fix this " glitch " xD. We got so many skulls I got a famed, heh. Well good luck to all, hopefully they purposly did this, lol.