Possibly Windows update reset. It is just a history page. Maybe just a glitch that did the reset of the history page.
To delete an update you have to go to the one I marked #2.
When I did a reset of Win update on mine all the updates disappeared as did yours from the history list/window.
As I installed new updates all the new ones are listed on both pages.
That is the best I can describe it for you.
Niemiro could explain it with more detail.
So it isn't a problem all the updates are still there.
It is possible that Win Back up does not include that history page in the back-up. So it would be blank when reimaged.
Macrium makes an exact copy of everything so the history page is included.
My best guess at this point.