The cross reference is displayed twice in Published Responsive HTML output. Even though the content is coming properly when you generate a PDF.
When i Checked the attributes of the cross reference the ID is coming twice, however i am not able to remove the ID. When i remove one ID, save and close the document. On opening the document again, the ID comes back.
Please refer to attached screenshots for clarity. Thanks in Advance!!!
3rd point in below image has a screenshot from published output.