Still Infected files on removable devices

My SEPM has clients that show "Still Infected" files on removable media, whether it be a CD or thumb drive.  Even when the device is removed, it does not clear.  The only solution I've found is to put in a clean disc or thumb drive, let SEP scan it and then it clears the "Still Infected" flag.

Has anyone seen this or know of a better way to resolve this issue?