I admit that my previous comment was tongue-in-cheek; I found it interesting that the two numbers were so close. To make up for it, I'll try a more serious response.
I suspect you are making a category error comparing "two parents who are both rather taller or both rather shorter than their child" and "two parents who are appear to be of one race, but their child appears to be of a different race".
To put the two into the same category, you could compare "two parents...taller or shorter than their child" and "two parents...lighter skinned or darker skinned than their child"---two aspects that are single traits. And no, I wouldn't be crazy surprised in either case, unless you were specifically thinking about Robert Wadlow and Zeng Jinlian giving birth to Chandra Bahadur Dangi or two parents of Danish descent giving birth to a child with a Bantu skin color. (And no, I don't know the relative frequencies of such events.)
The other way to resolve the category error, if you prefer to compare bundles of traits, would be two people of Italian extraction giving birth to a stereotypical Irish child. That sounds pretty unlikely, especially prior to modern travel and migration patterns.
But the real, underlying question that is the base for "many people really, really don't want race to be real" is, "So what?"
Yes, human beings tend to share traits with other closely related people. So what? Individual variation is pretty large, too.
Historically, Italians and Irish were considered to be different races. Not so much today, because "race" is a social construct and the difference between the Irish, southern Europeans, and the canonical northern European isn't a big deal today.
Races are defined to be a way of applying a group of conclusions, which may be difficult to perceive directly, to an individual who has an easily perceived marker for the race. That can be more-or-less neutral to somewhat pernicious. ("You are Asian, therefore you must be lactose intolerant!" Well, maybe.) Or it can be straight up evil, especially if the conclusions you are making are simply made up to enforce your superiority to the individual.
As a result, race is either not real, or real but completely uninteresting. Any other option is intellectual laziness at best and at worst....well, it leads to poor outcomes.
Now, neither you nor I particularly care whether homosexuality is genetic or a choice, but I hope you can see how someone who has to respond to "So just don't be gay!" might prefer one over the other.