I had something like this happen to me years ago. Its why I only post lower resolution versions on the internet, or higher res if its an unfinished project. I also had someone steal my mini essay from a debate forum and post it on another one as his own creation. In both cases it got resolved though. The former ended with an apology, the latter ended with me sending a message to a friend who was a moderator for the other forum at the time.
It sucks that sharing maps with a community can lead to this. May Sten-ret'ni be with y'all.