FOTRSU Campaign Mission Question

[Darkcrow]

Hi everyone. I apologize if this is the wrong place to post this (this is my first post) but I need some help. I'm using the FOTRSU mod and came across this one mission where it asks me to go to this one island and shell it. Well I spent 3 hours shelling it and it never completes. There were some ships anchored there but I sank them before the shelling mission was assigned. Has anyone come across this mission or it's type that knows why it won't complete?