This happens occasionally in my store also (2.2.5) but I was never able to spot the problem. Guessing, I figured maybe that a customer used maybe their cell phone/table to check the order status via email but then on another computer checked the status. I think it has a security type protection so only the computer that the link request came from can view it with-in a certain amount of time.
I would be very curious too to see if someone knows why that might be happening.
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