Hi Eric,
Based on your description, I created a PivotTable in my own environment with any simple data. I filtered the data but I cant reproduce your issue, maybe my sample data is incorrect.
I suggest you upload a screenshot so that I can get more accurate solutions to your issue.
If you have no verified to post the screenshot, please share the screenshot or a sample file via OneDrive.
You can also send the screenshot or the sample file to our email address:
ibsofc@microsoft.com I'd like to help you check it.
Please Note: The email subject you should use the URL or the Title Name of your case.
Im glad to help and follow up your reply.
Regards,
Melon Chen
TechNet Community Su