It does happen from time to time.

I did a lot of mult. male breeding in 08 and got 5 split clutches. The standout was a Bumble Bee/Pewter x Pastel breeding that produced:

1.0 Normal
1.2 Bees
1.0 Super Pastel
and a Killer Bee and Sterling -- BOTH MALES!!! Never could figure the odds on the 2 boys.