Hi tiannabidder,
Thanks for using Microsoft products and posting in the community, I'm glad to offer help.
According to your description, may I know if you have confirmed that whether the problem affects one specific document or all documents including the newly created ones? It would be helpful to determine if it is caused by the document or the application itself.
And if the problem occurs in all documents, you can perform an online repair to check the outcome: Repair an Office application
Please feel free to me know if there is any progress, I'll continue to help you.
Best Regards,
Arck