Problem with Hyperlinks in Wiki Editor

Problem with Hyperlinks in Wiki Editor

I can create and save hyperlinks to other wiki pages OK, but when I later open the editor, make a change (but not to any of the hyperlinks), and then do a save, the hyperlinks get messed up. Seems like the editor has prepended the URL of the current wiki to the old hyperlink again.

Is this a known bug, or am I doin' somethin' wrong?