Printing problems with pages

Hi,

Recently tried to Airprint a Pages document from my iPad and iPhone, and got the results shown in the picture below. Tried numerous times with the same document, and the "white streaks" are always exactly the same (same appearance, same places). Tried another document and same thing. Printing a recto document (or a 1 page document) in Pages always produce this result, whenever printing recto-verso don't! Tried the numerous tests provided by Canon for my printer, and eveything seems fine. Also tried to copy the content in Notes and printing result is fine. What is happening there? Everything was fine even 2-3 days ago!