The point is not that you aren't saving the game properly. It is that you are then being presented with a bunch of stale saves to choose from and are, from the sound of it, with no other viable choices loading up one of the older ones.
Again, delete the saves you don't need anymore from the Saves folder. And move any that you would like to hold onto for future reference perhaps into another folder on your computer somewhere. The saved game selector screen cannot navigate 163 game saves, and it's only going to show you a select few most likely the older ones rather the newer ones.