I think your situation would be an illustration that the markers are not tied to individual animal, sire or dame but are the usual expression of the heterozygous trait.
So even if your het pied does not have them, its het pied offspring will still usually have the marker because that is the most common expression.
Basically it has nothing to do with mom or dad, it has to do with het pieds, which in most cases display the marker trait regardless.
Whatcha think?
Justin