"exclusive" is the status the server designates when it needs a file, and blocks all access to that file. EG, when you download a file it needs exclusive access, so that status is listed during the download. Same thing goes for backups and verifications.
It sounds like you maybe had something that failed and the file is stuck in that limbo.
Are you familiar with using the Filemaker Server command line? Are you able to stop and restart the server?
I just did a "Stop server" and "Start server" and now its "Normal".