OK - I have made a discovery: The problem, for whatever reason, is class-selection related:
If I choose Barbarian as my 8th level, Dwarven Waraxe does
NOT appear in the Improved Critical Weapon List!
If I choose Ranger as my 8th level, Dwarven Waraxe does
NOT appear in the Improved Critical Weapon List!
If I choose Fighter as my 8th level, Dwarven Waraxe
DOES appear in the Improved Critical Weapon List! Winner winner chicken dinner!
I tried a couple of other classes as well, but the Improved Critical feat is not available as they don't improve my AB to +8 (I can't select Paladin to test since Bjarna isn't LG)
So I guess the question now is why is Dwarven Waraxe only available in Improved Critical weapon list for Fighters?