I just went to try again but because I clicked off to comment it won't allow me to access old files and is acting as if this is my first playhtough :(
I see
It definitely has to do with your browser, since the save files are linked to that browser. This is the first time I see this kind of problem (some people have lost their files after deleting cookies, but seeing the save file and not being able to access it? That's very weird). Also, if you're using incognito mode, that might have something to do with it