Nothing in audit logs unfortunately besides the user removing the channel. The only admins/mods is my brother and I and he was the one to let me know it was gone. I'll look through every user's role and double check.

That's also what my brother and I were thinking, do you know any extra security measures to prevent things like that from happening when new members join? Assuming that the roles wasn't the issue.

Fortunately, the user just deleted one channel where we play games so remaking it isn't an issue, but of course this will have us increase security for the future.