While I've seen this between the legs because poser doesn't like more than 2 groups together and there you ended up with 3, I've never seen it at the waist and hip. I'm assuming copied the joint zones since that usually gives more distortion. Where I'd try would be to make sure the skinning method is set to unimesh under the figure>skinning method and then make sure both joints have the bending checked on the properties tab.

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