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I advise you to go into the Maintenance section of your printer's software (which is sometimes reached through the printer's Properties, the Maintenance tab) and run one or two Color Alignments.
(Are you using Canon-OEM cartridges, or refills, 'Canon compatible' cartridges, or other non-standard supplies? if so, that might have something to do with it, though it is not certain to be caused by use of such not-strictly-Canon supplies.)