Run the calibrate now procedure at least 3 times to see if the situation improves. Are these hp original or aftermarket toners. Still looks like you may have a toner issue since the 3 color toners are off by the same amount indicating the black toner is the one that is actually off. To make sure the slot is not the issue, go to the diagnostics menu and choose the item disable cartridge check and swap the cyan and black toners. Run that same sheet again and see if the cyan is now off and the black is ok.
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