Test print great, document printing blurred

Question

I justed used a refill kit to refill the black ink.The text was blurred and looked as though it was running out.Filled the cartridge and did a test print after running through the auto cleaning.The test print looked good.The black text printed fine.Then tried to print a Doc. from MSword and the text is again blurred and looks like its running out of ink?!more test prints and all is ok.then back to MSword and the same problem.(tried notepad and wordpad and the same problem)Checked for latest driver too. I have the latest.any suggestion? uninstall /reinstall?