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Iframe not showing content

I’ve built my site and have been trying to put some banners on my site via an iframe.
Simple enough but when I add and publish the content doesnt show.

Looking at the source code and console there are no errors.
You can view the live code here (above the search bar):
https://www.pcpartcompare.com/product-categories/all

Does anyone have any idea why this wouldn’t be showing? (I’ve search the forums and most of the time it is either a code/content blocked issue but this doesn’t seem to apply in this case.)

Thanks

Tim