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Could be a mere statistical aberration. Four shot groups aren't big enough to rely on. A rifle and load combination that shoots into 2" will sometimes plant 3-4 bullets smack on top of each other by sheer chance.
I must confess that I do early load development with five shot strings. I then take the best group and load and fire 20 rounds as four groups. Twenty shots IS enough to tell me something. Sometimes the four groups will match the first, but often they won't.
What a single four or five shot group will tell you is when it's hopeless to try that load any more. When a rifle that you know will shoot consistently under an inch with a good load sprays five shots into something over 2", it's time to try another load.
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