En familie av Microsoft-produkter for tekstbehandling av programvare for å opprette nett-, e-post- og utskriftsdokumenter.
Hi! This is King, an Independent Advisor, I am a fellow customer and expert user here to help.
To address your concerns, installed add ins might be the one responsible why you are having highlighting issue. Removing them might help you gwt back to normal behaviour.
https://support.office.com/en-us/article/view-m...
If problem still exist, repairing office might help you.
https://support.office.com/en-us/article/repair...
I hope this will help you to resolve your concerns. Please don't hesitate to reply if still have some follow-up concerns.
Regards,
-King