Was there an error if I received two different deployment awards for the same time period, and they have the same order number?

Well, that's just plumb strange

Best to have it sorted preferably in favor of the higher award. Awards get entered in your record which gets reviewed by the O-4 board. Any reviewing officer will do a head shake if there's two for the same thing. Or maybe whoever enters the record puts the lesser one in and you're walking around with the higher one in your photo. I could do Achievements and Commendations back in my time. Don't recall ever double tapping anyone. If you're zoning soon, it's better to have the Comm with a previous track record of Ach's along with an "upper third" report. Discrepancies in records tells a reviewing officer one thing. The SM didn't check to see if the record was correct.

If they have the same order number, there is only one award. You need separate order number for each award