I'm not sure if this is related to this, but I've got an "'Entry flags" box coming up on my Create Entires page, with a checkbox for "Flag this post as an official community post". A friend of mine says that this is meant to be for community moderators to use - if that's the case, then something must be going wrong here because I'm not a moderator of any communities.

I'm not sure if ticking the box does anything, as I've left that alone.