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Thanks for the feedback.
This is Tim with Microsoft Office 365 SharePoint Support.
If you are seeing text overlay and then refresh the page and it leaves, you may bee seeing an issue with corrupt cache or temp files. Feel free to provide me with the URL to your website and I will see if I am seeing the text overlay.
Microsoft Office 365 SharePoint Support
That maybe caused by you coping the text directly into your webpage. Take a look at this --> Don't Paste Directly into Your O365 webpage