Well, personally, I thought the aliens in the film looked rather weak, so the redesign for the series is an upgrade. They look stronger (which, I think gives even more irony to their fall from bacteria), and they have more of a bear-like bulk, which is reminicent of how the Martians are described in the novel.
But to answer your question: no one really knows for certain. I have a theory about the differences that ties into how no one remembers the real invasion, but the more bare-root theory, and others seem to follow this, is that it was simply done as an idea on how to improve the original design. Unlike the brilliantly done war machines, I don't think many would argue over the aliens looking rather lacklustre. And given some of things the aliens would be doing, I think the alteration worked better.
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Formless, faithless, and free.
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