Several devices are reachable via SNMP but will not model during discovery

Document ID : KB000124028
Last Modified Date : 31/12/2018
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Some devices appear to be reachable via SNMP but are not discovered/modeled
Spectrum 10.2.3

In the Discovery window, we can see Filtered by: Discovered IP. 

This means that under Modeling Options->Filter Options there is a filter set that is likely filtering out the devices

Clear or modify the filter to allow the devices to be discovered/modeled.
Additional Information:
One way of verifying it is an issue with the Discovery configuration is to try and model the device by IP from the Topology in OneClick