Post? I think you mean devlogs.
Someone who knows more can correct me, but as far as I understand, what you're seeing is the change history of that channel so you can associate it with your devlog. From what I've read, Itch doesn't offer any commands to manipulate that history, but in theory, it shouldn't affect you at all. The idea is that when you write a devlog, you'll be doing so based on the latest version you upload.
From what I understand, it's similar to GitHub. You have your game files in the final version, but you also have a change history, and it's supposed to be possible to recover an older version thanks to that history, but I've never tried it.
Butler manages that history automatically. Your players and the website should only see the latest version. If someone downloads your game, they only download the latest version and not the history, so it shouldn't be a problem.
