Sorry..your printer is just assuming it is plain paper and dosing the A4 with plain paper quantities of colour! No cure..don't do it! get used to small prints
It would appear that the MG 2560 cannot print A4 colour prints. It is outside the settings allowed.I spent two hours being "helped" by a sevice person from canon call centre. I came away convinced of two things...the printer cannot print colour phots...