Oh, Naima, I see it so clearly now!
Sorry, I could have noticed it earlier from your comments on other threads, but... You are in fact using only one euler pole for all the plates, which is wrong - it would be a coincidence with, say, 0,000001% probability.
Each plate has its own movement, defined by an individual euler pole. In fact, because movement of the plates is always relative to other plates, scientists even use separate euler poles, within the same plate, depending on the pair of plates they are studying. Definitely not the same pole for all plates.