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Reported here: http://seclists.org/nmap-dev/2014/q3/137 Hostgroups should have a common outgoing interface and source address, determined by target_needs_new_hostgroup. Source address for raw IP probes (sendIPScanProbe) is taken from the list of decoys (o.decoys), which always at least contains a "self" element at index o.decoyturn. This element was not being set while filling a hostgroup for massping, so it was using whatever the value from the last hostgroup had. This only matters when mixing targets that require different source addresses, as demonstrated by scanning localhost and some other address.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).