If the whole assembly (i.e. the primer shuttle, sub-plate, etc.) is rotating, it is likely not related to the timing of the pawls, since they only affect the advancement of the shell plate relative to the sub-plate, etc.
When you push back on the handle to prime, look down at the toggle and lower ram. Are they rotating too, relative to the press frame? If so, I'd look for a loose/worn pin, link arm, toggle, or something like that. If not, I'd double check that the screws holding the sub-plate assembly to the top of the ram are tight. Otherwise, call Hornady.
Andy
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