The policy section displayed on the eBay product page is garbled, but when clicked on the template to modify it, you don't see anything wrong.

It is because the policy part has some previously filled text or other content formatting still remaining here. Although we cannot see those format, the code still exists.

Solution：
Click to open the text edit box of policy section in turns, select all (ctrl+A) and delete (backspace or delete). Every edit box must be operated, even if it seems to be no problem.

If there is some content need to retain, you should save it to the computer in advance, or copy those text, picture link, etc. and paste it to the box after emptying the text edit box completely.