Where are recently used projects stored? The reason that I ask is that you are allowed a max of nine. I recently deleted from my PC some that were no longer needed. But what I see that they still appear on this list & there failure to be removed appears to prevent other older ones to appear.
The list is fixed in size and removing something will not cause something older to re-appear. The list is populated as you open projects. If you select a project which has been deleted/moved then, you get an error opening and it will simply be removed from the list and the list will contain one item less than before.