Is this a bug?

[Sagan]

I've been playing in carreer mode. I depart from Pearl Habor and its 1943. What the problem is that I'm stuck in a mission. The mission is to go to Hakkudo and destroy enemy merchant ships. I play the mission I complete the objective and return to base. Ok so far so good. When I chose to play the next mission it gives me the exact same mission. I did this 3 times. I'm getting tired.