This situation is unfortunately not terribly uncommon. It has to do with the "year bred" date. Often what is recorded as year bred is really an official, or quasi-official, introduction date. We'll have to add this to our list of items to double check but the incongruity of the dates does not mean the parentage is invalid.

If, as you've done before (thank you!), find a reference to contrary to this parentage please let us know.