I have an HP Office Jet Pro 8100 that goes through Cyan ink (HP cartridge 951) at an outrageous rate. I replaced the last one while the other 3 were greater than 50% full, and seldom printed in color - not more than 1% in color. Now the replaced cartridge is empty again while the other 3 still have a good amount left - and I haven't printed anything in color. Sowhy am I burning through Cyan ink?