That's really weird. I can't think of any reason for that to reset without you actively trying to. That information is all saved to a "persistent" file in the saves folder which also has backups that should be used automatically if the main one is missing or if the game is reinstalled.
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Reinstalling won't do anything cause of how saves work with renpy games. Was there anything else you did besides reloading a save and full screen? I can't seem to replicate it at all. And if you didn't know, in preferences there's a setting to skip unseen text if you want to be able to skip through things again.
Honestly yeah, as far as I remember just that. I genuinely wouldn't be surprised if (and kind of hoping) it's just a thing on my end, my laptops genuinely falling apart as I speak, so it could've just been a corruption error??
And thank you for telling me about that setting ❤️I wish I checked that earlier 😭