Armor has disappeared from my armory in reach

I recently purchased halo reach on xbox 1 and when i went into the armory i had pretty much all my armour except for probably my favourite piece, the security right shoulder which i now have to purchase again, on top of that for some reason my credits got reduced so can’t just purchase it again, just wondering if there is a fix for this? not concerned about the credits i really just want that shoulder piece back