StableBit Scanner won't repair the drives. Eg, it never writes to the drive (the exceptions being the settings store, and if you run file recovery)
That said, it will rescan the drives, and update the results.
The important bit here is the long format, though. This writes to the ENTIRE drive, and can/will cause the drive to reallocate or correct bad sections of the disk. As for not correcting right away, it has to run the scan again, and unless you manually cleared the status, it won't do this right away, but will wait for the 30 days (or whatever it is configured to)