Why are the images in my summary cards getting cropped to rectangles when they are squares?


In the card validator it shows the images as being square, but in actual posts, they are rectangles. The source images are squares.
Example: https://twitter.com/lizperley/status/490189348462002176


Oops, I deleted that tweet by accident because I thought it was a random testing tweet, an example is here https://twitter.com/lizperley/status/491647822022717440


Hi, Getting the same for some test tweets https://twitter.com/IWtesting123/status/490165497049407490 is an example. As @lizperley the validator is showing the image in its correct aspect ratio. The image itself is 120x120 pixels. The page url is http://www.water.ie/about-us/jobs/commercial-support-office/