I'm not sure
I don't recall setting up this board that way, but OTOH, it does have a unique setup by virtue of being semi-open to public posting (after review); there may be a side-effect at work here.
Before I "fix" it though, I'd like to ask the Space mods if they can think of problems with allowing editing. One consideration: DamnTikiWiki doesn't seem to track changes in posts, the way it does all other user-editable ("wiki") features. Bummer. I want accountability.