I've noticed that the main images of my blog posts, when in the Single Post view, are blurry. If you click on them they open in a crystal clear state. I have tried different sizes of images with no improvement.

I have attached screenshots of what I mean, but you can also view the live example here: https://www.midweststitch.com/blog/entry/customize-nike-shirts

You can open other Easy Blog posts here and see something similar: https://www.midweststitch.com/blog

Is there a setting or something to clear up this main image? Please advise. Thank you!