Images not showing

Hello,

I'm using the Generate Press theme for my website and out of the blue, some of the images from articles are blank. They are not showing and instead, there's a blank space with the link.

When clicking the option to view image I'm directed to following address:

data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7

It seems is the same for all images that aren't showing.

Here are two articles so you can check it yourself:

http://prepperswill.com/survival-hammock-tips-tricks-learn/
http://prepperswill.com/need-air-rifle-survival-hunting/

I've tried to edit a few articles, but the images are showing in the edit page. However, even after updating them, they are still not visible on published posts.

Can you help me solve this?

Thank you!