Once an archive is made, it does not show in the load panel as an active moment of the game. The archive must be restored to be reflected in the load panel. But be aware that what ever state of the game that was represented in the load panel before the archive was restored will be gone.
So in other words, when you restore the archive, that becomes the active state of the game. There is only one game state "active" at any one time. Let's say I archive at turn 108, then play on to turn 125. Load panel says turn 125. If I restore the archive I previously made, it will be at turn 108 again. If I did not archive at 125 before this, 125 is not recoverable. anymore. i will only be able to play turn 108 forward.
I think there is a write up that may better explain this in the manual.