Hello Teresa,
Welcome to Microsoft Community and appreciate your time taken for sharing detailed information. I could share with you some of my thoughts on this issue.
Some questions before proceedings. Is this the only documentation going to have a problem, or is it the same for other documents? Is the language you entered the same as the language in the original document? Have you ever entered some special characters (e.g., math equation)? I want to ask what your version of office is like. Have you ever tried to go back to its original state and see if the content will reply? (Ctrl +Z) But if you have exited and then entered, it will refresh again, then you cannot go back. You could also try changing the format of your Excel, changing it to another format and then changing it back to see if it works.
Feel free to post back if you need any further assistance.
Best Regard,
Kevin | Microsoft Community Support Specialist
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