Clicking an image in a post leads to "OOPS! THAT PAGE CAN'T BE FOUND."

I just made a new post last night. This one:
https://justinsmithart.com/2016/01/07/return-to-oils/

If you have a look, you’ll see that only a few of the images, when clicked, lead to another page where you can see the image by itself and click again for a larger view. Most images, however, lead to the dreaded “OOPS…” page. I’ve looked through some earlier threads involving the “OOPS…” but couldn’t find anything related to clicking on images. Some causes I saw were that GoDaddy (my host) was having issues at the time or that there may have been malicious code in the theme (I’m using one called Alternate), but the same thing happens when I live preview with other themes.

Any advice is greatly appreciated. Thank you.