I've gotten several complaints about this, it's seems like it's checked by default for some reason. Please make sure to uncheck it if you create a community, ESPECIALLY if you make multiple in a short period of time.
Edit: this has been fixed piefed dev, but please make sure it is unchecked
Honestly, this is something the instance-admins should impliment: intercept that setting so it hands the content only to !newcommunities@fedinsfw.app , and not other instances
It's already been fixed by the piefed dev