A family of Microsoft word processing software products for creating web, email, and print documents.
Not to be pedantic, but "up to date" can mean several different combinations of ingredients, each with its own set of considerations :-) Please go to Word> About Microsoft Word in the main menu to determine the present Version of your Mac Office software. Include that in your reply as well as the release of macOS you're running it on.
Additionally, is this happening with one specific document or are all documents affected? Do you see similar behavior if you open the same document(s) in other programs"
What other details can you provide?