Stretched / Blurred Images on Twitter Cards



I was hoping to find some assistance for a problem I am having regarding stretched or blurred (pixelated) images on Twitter Cards.

I have two blogs: and, both with Twitter Cards enabled and whitelisted. I have added to required coding to both blogs, with Large Summary Cards for the first and normal Summary Cards for the second. Every time I include a link to one of the blog posts in a Tweet, the image that is displayed in the card is horribly distorted. I have made sure the image that embedded in the blog post adheres to the correct dimensions and is smaller than 1mb.

Can anyone help me solve this problem? Is it perhaps a problem with the code?