The printer is making ghost print/watermark of what it just printed? -

Does anyone know what could cause this, and how to fix it?

Clean the drum. i suspectthat youhave a laser becasue deskjets don t have this problem LOL. Clean the drum but make sure that there is no direct light hitting the drum as it could damage it. Use a soft cloth and just running it lightly over the drum. rotate it by hand and don t worry, nothing is going to break LOL.. Use microfiber cloth. They are the safest. Now the printer should print perfectly.