Campaign missions disappeared

so i beat campaign on heroic and decided to go back and try to find all the skulls and intel, the only problem is it will only let me play certain missions, the missions being,
Swords of Sanghelios
Enemy Lines
Before The Storm
Battle of Sunaion

whats more is my service record says that i haven’t finished the game and the mission intel screen is missing every level but those shows where they should be and how much intel i found but no titles. ive looked around but cant find anyone with a similar issue.