Limitations of Ren'py and how I've designed the game. Gallery / character unlocking is tied to persistent values (Saved to your computer, or in your case, your browser cache) and isn't tied to game-save state.
The only way to unlock them is to run through the game again, or join the Rogue+ Tier ($5) on Patreon / Subscribestar, then you have access to an unlock code amongst other benefits :)
Hey so I just started playing earlier today, and I have an issue with the gallery and Character pages, I didn't do any syncing of saves to or from web or mobile, I just have the game downloaded through the app. I had something come up while playing so I closed the game and just booted up again a few minutes ago, and all character and gallery data is locked again. Is there any way I can get around this?
Okay so after saying all that I relaunched the game and it seems to have fixed it. I don't know what happened but now you know something is up at least. I hope this helps in some way.