Basically you have a couple scenarios as to what happened:

1) Its just an extraordinary example of a pastel (that looks like a super). Bred to a confirmed normal would produce 50% pastels.

2) Your "normal" was a really ugly pastel (doesn't seem like this is very possible) and this is indeed a super pastel. Bred to a confirmed normal would produce 100% pastels.

3) Your normal is in fact a normal, but during some point in cell duplication (would have had to be early on) the allele paired with the pastel gene (aka normal allele) was destroyed, and the mutant allele (pastel) was duplicated. Other things that could have happened would have been a mutant allele interacting with the pastel allele to form the phenotypic appearance of a "Super Pastel".

Just a few thoughts to ponder.

Think it was last year or year before, but Ralph Davis produced a clown from a clutch that had clown genetics on one side.