the web. it might not be fixable idk
Hm, I don't actually know how web renpy saves files, but I would assume it's something related to cookies or local files.
I know you can import/export saves between the desktop and web versions, if that helps?
If you hold down the Control key to skip and put on easy mode you can get back to wherever you were pretty fast too.
I'll probably add a cheat menu sooner or later to help, but that is gonna be a ways out.
RenPyWeb saves are stored in the Index DB file system using IDBFS, specifically under the path /home/web_user/.renpy. Saving is done by calling the function create_persistent() from the file renpy-shell.html in the source code. You can inspect the save data using the browser storage inspector.
However, this means that the data is not permanently persistent. It will be erased given time, both inactivity on when the data was last accessed and how many times the browser has restarted count towards it, from what I remember. If the user simply left the save games in the browser expecting them to be there when they returned, that is likely the cause. It is best to always export saves from the browser, if possible, to ensure persistence by importing at a later date.