If you had previous saves files with the same name/placement in the grid, they will take priority. Try clearing them out or cutting them if you want to have a backup, also consider that alongside the saves in the game folder there is likely a renpy folder in the computer that will have a copy of the save files that you also need to check:
You can get to the AppData folder following the path or by pressing WinKey + R, then pasting %appdata% in the textbox to go to Roaming directly. Make sure Hidden Folders are turned on since App Data is a Hidden Folder