Oh, I didn't know that since I don't use itch app. I kept all older version for the sake of archive, and they are all hidden at the web page, had no idea they shows up on app.
For now I'll just keep them up as they are, since they comes with version numbers I believe it's not hard to know which one is the most recent.
If it's something else you meant and I miss understood you, please send a screenshot of app page so I can have an idea, thank you beforehand.