A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Dear Ken Wheeler,
Greetings! Thank you for posting in Microsoft Community.
As per your description, please let us cooperate and please don't worry, we can work together to narrow down and resolve the situation.
May I know if the Excel file is saved in OneDrive or SharePoint and shared with other users to collaborate?
If yes, if someone else is editing in the file, you will find the situation as shown below,
his profile image will appear in upper-right corner. You will find his editing is highlighted.
For more detailed information, you may refer to Collaborate on Excel workbooks at the same time with co-authoring - Microsoft Support
We hope above helps.
If our understanding of the scenario is not consistent with yours, feel free to point it out. We will continue trying best to assist you. You may share some screenshots about the situation on your side.
Thanks for your cooperation! I hope you keep safe and healthy always.
Sincerely,
Tina | Microsoft Community Moderator