So I know that Elroy has made a visit to your lab and was working on Windows/Office compatibility issues.
1) Click on the cell and see if there is more information in the cell and if it is a formatting issue.
2) Check the custom templates folder, if the document has been updated, but you have an old custom template, there could be problems.
3) Check the data back in the data entry screen.
Maps Version:
Windows:
Office: