Dear Craig Miller1,
Thanks for posting in Microsoft community. We are glad to help you.
We test the feature on our side and we couldn't repro the same issue, so we would like to confirm the following information:
1.If new created pie chart with same data in same workbook will have the same issue?
1).If the new created pie chart has the same issue, please check the pie chart feature in a new created workbook.
2).If the new created pie chart still has the same issue in a new created workbook. Check the pie chart feature in Excel online with same data.
2.What is your office version? You may check your version information through Files>Account, kindly share the version and build information with us.
3.If you colleagues have the same issue on their side?
Thanks for your understanding and cooperation! Have a good day.
Sincerely,
Sean | Microsoft Community Moderator