Inkt wipes out

Every time i highlight on a printed document from my Envy 5530 the inkt that is highlighted wipes out. This is annoying because I'm a student and I highlight a lot.

I tried different types of paper, but nothing changed. The printer has only one type of intcadrige (as far as I know) so I can't change it.

Does somebody has any idea what the problem could be?

Thanks anyway
Ps: Sorry for possible grammar errors, but Englisch isn't my mothertongue.