Terminals and stats

Hello my problem is that I have completed the game got all 7 terminals and in waypoint its saying I have only completed 4 out of 8 missions but shows all 7 terminals, The other problem is that when I put the codes in for the terminals it says I need to access terminal 1 on or near installation 04. what does this mean? I contacted xbox live they where no help. So what do i need to do any help would be awesome. PS I completed the game offline not connected to xbox live if that makes a difference.

PS I completed the game offline not connected to Xbox live if that makes a difference.

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i completed it online on easy first of to get all the terminals it has registered ive got them all so maybe that’s where your going wrong. for me though ever since then halo waypoint isn’t allowing me to enter codes in the classified section or even see all of the terminals ive unlocked in the halo 4 campain or from anniversary
and it seems it isn’t just me getting this,all that comes up is error please try again,and my Xbox cant connect to the server ethier

For your Campaign completion issue please re-complete the chapters which are missing from your Service Record. Once you do this, Waypoint will show the correct amount of chapters completed.