People make mistakes all the time. And those who don't know any different may be repeating what they were told or what they discovered in their research and believe to be true.
What kind of comb on the blue bird? If it is indeed an Australorp, then it should be straight, similar to but maybe...
Well, I can guarantee the blue one is NOT Leghorn per leg color and comb type.
If the white one is Leghorn it should have white ear lobes. If the lobes are red then it may be a white Rock.
Both appear female if stated age is correct. :love