In your HTML source, I can see that:
https://i2.wp.com/www.willyurman.com/AdayAphoto/wp-content/uploads/2015/12/12.16.2015.jpg?zoom=2&resize=940%2C627
Looks like you use a plugin or a theme that handles the image directly instead of normal processing and resize then (and zoom?). That’s very odd… PictureFill might be confused with this kind of trick. For that one, maybe you could disable the 4.4 Responsive Images through the options of the plugin, did you try? But the theme is basically doing something unconventional. It should register the image sizes rather than a dangerous handle that takes care of the images by itself.
Then I tried one of your photo in an article like:
https://www.willyurman.com/stories/wp-content/uploads/2015/11/FleckThumbnail1-384×285.jpg
That redirected to me to the index of your website! Weiiiird. If the image doesn’t exist, it should be a 404 error. A redirection for a non-existing image is not a good idea. Not sure why it does that.
I think you should contact the author of your theme, maybe this developer will have idea of how to do this properly.