You are viewing: Accelerated Mobile Pages (AMP)
Here is an example of this issue on frontend:
The issue happens when third-party extensions or themes modify product page layout and thus add additional content.
Go to your AMP Product page and open Iframe source in a new window:
Enable template path hints and find Magento blocks you want to delete in Iframe
Go to your theme folder and create the following file:
Remove the extra blocks you found in step 2 using layout instructions
Clear the Magento cache
Now go back to your browser and refresh the AMP product page. The AMP Iframe should be displayed correctly.