To fix this go to something you want to print. Then when printing, choose a print style→ Tap the “layout" drop down→ select “Finishing” make sure print style is 1-sided printing.
Dont print yet. Then go above where it says “Presets” and select “save current settings as preset”
Save Preset name to “One Sided” and make sure it has all printers selected.
Then print the page.
Make sure in the future that you have the “one sided" preset selected if you want to print one sided.