bug on confirmed missions Halo 3

Games Halo: The Master Chief Collection
1

Hello,

I’ve finished all the mission of Halo 3 in legendary, and it is indicated in the mission selection, but for the success about ending all mission in easy, normal, heroic or legendary it says that I only have finished 8/9 missions. Can you solve the problem or tell me how to solve it please ?

PS : I’m french, sorry for bad english

2

Problem solved, I’ve done again one mission which I didn’t get the success about completed her.
But new problem… ^^ after having earned the LEGEND success (all missions in legendary) I don’t even have my armor Helioskrill :confused: