images on blog posts are blurry, but lightboxes look fine

Images in my blog posts appear blurry on the backend text editor and on the frontend frontpage and the blog article, but they look fine in the lightbox. See example at http://theoutsideguide.com/blog/home/goodbye-winter-hurry-up-spring

I copied my EasyBlog backend Media settings and Theme image settings, they're attached. I think I have something set wrong, but can't figure out what. Can anyone offer some advice?

Thanks in advance!