On the ipad version of Power BI app , Table visual shows the outline of column header randomly when the user click/select the values it shows up.
This is persistent on the broswer and desktop version
Please find below ipad view screen shot for reference.
Let me know , is there any option to avoid this random behaviour of table column headers on ipad.
From your description, it looks like the issue happens with Power BI mobile app in iPad, right?
Please open the same report in browser. If there is no issues in browser, please update the Power BI mobile app to the latest version then test again.
Best Regards,Qiuyun Yu