Hi Abh,
It seems that you enable some add-ins in your Excel 2016 applications. I suggest you run Excel 2016 in Safe Mode to check if the issue goes away. If yes, I suggest you disable some add-ins to see the result in the normal mode.
Meanwhile, I suggest you check if you are using the latest version of the Excel 2016 application. If no, update the version first, restart the computer and then do a test to see the outcome.
Moreover, upload a full screenshot of the Account page in the Excel 2016 application you are using. You can access the page via File>Account.
Note: Remove any private information before uploading the screenshots.
Thanks,
Cliff