Your son has only inherited half of his father's DNA, so that is why your OH has DNA matches who don't match to your son.
Sometimes it can be difficult or impossible to figure out how a particular DNA match or group of matches are related to you / your OH, for instance if they don't have a family tree or if there are ancestors in someone's family tree who aren't the biological ancestors. I have plenty of DNA matches whose connection I haven't figured out yet.
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