If you have a hearing on the court's calendar and you've given opposing counsel proper notice, then you definitely should go to your hearing whether or not you think opposing counsel will show up. The judge will handle the problem if they don't show up.
I would speak to opposing counsel about the inconsistencies you found in the order, and see if you can resolve them together. If not, get clarification from the court first before you pay the money owed. If you are really worried about not paying timely, you can place the funds in an escrow account pending resolution of the matter by the court.
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