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This issue is already assigned to our developers. They are working to fix it. When they fix the issue, we'll update you.
When you click "Enter" to break line in Hover Text, everything seems good here but in the preview of your form, unfortunately it perceives "Enter" as <br> HTML tag and you see these HTML tags.
My advice is to remove "Enter" in Hover Text editing part and using only "Space" to separate your sentences as show in the following image.
In this way, you will not see HTML tags in the preview.
If you need any further assistance, please feel free to let us know.
Thank you for your understanding.