OK. I see what's happening and it isn't limited to just defenders, although the range increase set bonus from the defender ATO does work.
Power pool melee attacks:
Fighting pool>Boxing and Kick
Flight pool>Air Superiority
Defender>Electric Mastery APP>Thunderstrike
Defender>Power Mastery APP>Total Focus
OK. I'm not going to list all melee attacks, but, as more examples, Brute>Battle Axe>Beheader, and Tanker>/Firey Melee>Scorch.
It seems that a lot of melee attacks, including the examples here, have a base range of (7). This would explain why the Defender ATO set bonus and other range increase powers will show a range increase of melee attacks. It doesn't give melee attacks range, only increases the range on attacks with a base range.
I'm not sure if melee attacks are suppose to have a base range of (7) but not all attacks are showing it.