SH4 Career same and same mission again

[TresherSub]

Im new here , my first topic ...

Well when i complete the first career mission (mission 1) where you have to go to a orange point then destroy 10000 tons of ships. after i complete all i go back to my spawn point then i completed mission , gives me medals and etc.
if i click start mission it gives me mission 1 again but i have completed it

any help please? i want to play that damn career , it looks interesting

sorry for my bad english