A family of Microsoft word processing software products for creating web, email, and print documents.
I've seen a fair number of screen shots like this in the last month or so. I assume it's a bug in a recent update.
Put your screenshot on a Word page. Then choose File>Feedback>Send a Frown. Describe the problem, include a screen shot, and submit. The bug report will go to the Word programming team. They are unlikely to respond.