for Spectrum, a Device MAC should be unique. Sometimes, interfaces of a device could potentially have more than MAC configured. In that case, if two devices have the same MAC configured at the interface level and the Discovery Profile contains both devices, only one of them will be discovered.
Creating different profiles with each of the devices on each profile will solve this problem.
However, when using Network ranges (when it is not clear what IP's are going to be discovered and modeled), we do not have that possibility.
It would be good to include onto the Advanced options of the Discovery Profile to include a MAC Exclusion List as we have in for the IP's or a Filter Interfaces by Ranges when Discovering.