Unable to set paper size on HP Deskjet to letter size, keeps reverting to 8x10

When I download a driver for my hp deskjet 2600 printer, the printer initially is set to having 8x10 inch paper. I change it at the printer level to 8 1/2 x 11. but when I attempt to establish that size in printer settings, it keeps reverting to 8 x 10. This seems to be causing issues in that items at the bottom of the page are not printing. Maybe it is a compatibility issue although HP is supposed to be friendly to linux. I’m running ubuntu 18, and Libre 6.

Hi, Just wondering if you ever resolved this because I am having the same issue. Thanks!