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Sounds like you might have a good DOCUMENTARY genealogist who knows next to nothing about DNA science. They are two entirely different skillsets.

DNA science is, by no means settled. We know a lot more about it than we did a decade or so ago and I'm aware that certain markers are prevalent in female lines whereas others are prevalent in male lines.

I am also aware that siblings from the same parents may show different DNA results for the same reason that one may be brown eyed and one may be green eyed . . . the luck of the draw. But my mind freezes up with this explanation as well.

Documentary genealogy (where I'm pretty good) and DNA science (where I am not) are more different than brain surgery and proctology. A reputable genealogist should recognize this.