i chose to use 17x22 paper all goes south
I can see what is happening, but I don't have the manual or the printer, just the driver.
When I select 17 x 22 paper, the output automatically grays out the 17 x 22, and substitutes a smaller size; input paper feed is set to Manual Front.
See screen snap 20 of Manual Front paper feed. You can see the paper size shows 17 x 22 to 8.5 x 11.
If I change the paper feed point to Manual Rear, then I get what you see in snap 21.
Then I get 17 x 22 to 17 x 22, indicating that it seems to be accepting and keeping the 17 x 22 paper size.
Have a try changing the feed and see what happens.
Must be someone out there with a 3800 and 17 x 22 paper to test this.
Fred