Replaying Chapter 1 Story mission

[Bremmon]

So I went in to replay the chapter one story mission. . . When I get the mission from the counter it says level 5-15. But it also has three question marks on the right of the mission screen where usually the enemies show up. I have run this mission several times now and question marks are still there. When do those get filled in?

Also, I notice that there are two items that are displayed underneath the question marks. . . Are those items you may get as loot and you just have to keep running the mission to, hopefully, you get it?

Please help me understand. I have seen this screen on all other missions, I guess I am just now trying to understand it :)

Thanks.