In the wordpress.com/discover feed, we sometimes display oddly-proportioned attribution avatars/site icons. This appears to happen when Editors have uploaded a custom icon that is not square-shaped. We should be cropping these to a square when we display them.

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I can repeat this — testing in recent Discover feed with https://wordpress.com/discover using Mac-n-Chrome.

Look next to "Originally posted on" to see the squished avatar image.
Should be fixed now — just gave a run through the Discover feed and couldn't reproduce anymore.
We corrected this in the API, rather than on the front-end in Calypso: Discover now auto-crops icons down to a square when serving them up through the discover_fp_thumbnail_url metadata property. 👍
cc @hakanb