Jim,
when printing from Acrobat make sure that page scaling is set to 'none' in the page handling section of the print dialog, it defaults to 'reduce to printer margins' which will scale the whole page to fit within the printers printable page area, no matter what you set the margins to when you created the pdf.
Regards,
Scott
MSI Creator ZP16, i7-12700H, 32GB RAM, RTX 3070 8GB