hp latex printhead y/k test problem

Hi all, we have hp latex 260 and after cleaning the print head and print test with this result, the yellow head number 4 is new, before the change effect was the same as in the picture, under the yellow lines appears a pink color, I do not know what may be the reason and I would like to greet you for help and have a nice day

This is not an issue. This is intentional to be able to see the yellow ink easier as it can be hard to see sometimes.