It seems as though Poser always insists on pasting nodes in a slightly different position than where they were copied from. This can be irritating at times, and some of us try and compensate by pre-positioning the nodes before copying them. However, in much the same 'clever' way that it insists on not allowing easy workarounds for the horrible light bugs, it seems to have the ability to make things even worse in this case. Bottom line: don't reposition nodes prior to copying. If you are creating a product for sale, copy/paste them as normal, then reposition manually before saving.