Bizzare print-to-pdf page size default - LO issue?

Open xslx file from a correspondent. Print to physical printer, the print dialog preview looks fine, letter size 8.5x11. Print to Microsoft Print to PDF, the page size in print dialog defaults to 4.13x9.25. What?? More pertinently, how to persuade LO to default to the same page size as document?
This for sure does not happen with other apps, or with LO Write.
thankyou
P.S. Why required field “category” is not labeled “language,” I know not.