I just bought an HP OfficeJet Pro 7740, and it does not properly print duplex on the long edge. Regardless of whether I choose printing on both sides flipping on long edge or short edge, it always flips using the short edge. I've tried this with multiple applications, and it does this with each application I've tried. I've also tried this from multiple machines (both Windows 10 64-bit) and have had this issue. There are no error messages on either the printer or in Windows when this happens. Any help in resolving this would be appreciated.
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