Workiva employs a number of checks that guarantee the integrity of your data, including including a check to see if formulas will calculate correctly. If an issue is found, we correct it and create an audit event in your logs. A "Workiva updated formulas in this file." message will be shown in the History panel of your file.
Should I be concerned?
Not at all. This is ensures that your formulas are working properly.
Is there anything I need to do?
No, this message is triggered automatically as part of our normal operations. No action is required on your part.