This scenario can occur if a job is cancelled and restarted whilst an index is being built.
This is a timing issue. If Oracle completes an index build before the cancellation of the job takes hold, QSA thinks the index build was cancelled when it actually did complete.
WORKAOUND:
Drop the index and restart the job.
STATUS:
Enhancement request CR0206469 has been submitted to Development for consideration in a future release of Space Manager with LiveReorg.