magenta ink is mixing with the yellow.
i dont know if its from leaking cartridges or internally within the printhead.
you can try a cleaning cycle then pullling the cartridges out and waiting several hours before printing the test pattern.
if you still get cross contamination, i would guess that...
this may seem anticlimatic but when i refill canon cartridges, i just pull the original plug from the old cartridge and reinsert it after i refill.
To do this i just use needle-nose pliers and a small screw. Heat up the tip of the screw on my gas stove till i can see a slight glow, then i...