MyBB Community Forums

I have a specific subforum in which guests can post, the problem is that when guests post threads in the subforum the forum assigns threads made by guests to random users. So a guest makes a thread, and then it looks like a registered user made it when the user has nothing to do with it. It's only when viewing the forum and last post, in the thread itself it's visible that the guest is the first post.

How do I fix this?

What's the link of the affected forum? What's your MyBB version? Provide your plugin list and the results of ACP -> Tools & Maintenance -> File Verification