It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

I don't remember if I had destroyed the pirate fleet (I may did it, or it didn't appeared), but I couldn't finish the mission.
EDIT: It seems good in my new started game.
Post edited May 07, 2018 by ERISS