When you mix albino and regular, you can sometimes get some "off-colors". They could even possibly carry the coloration for F0's. It doesn't mean they don't have the albino gene nor the brown gene.
Some people are not as conscientious in their breeding of albinos so it's possible there are other coloration genes present. Biohazard deliberately crossed an albino with a brown and 1/2 the brood were of each. As they grow and lose their fry colors and move into the adult colors, some display faint coloration's I would not expect on full brown.
Regardless of the reason, enjoy your new babies!