Featured Image/Slider Not Displayed After Logging Off

I recently created a new post (called: Nintendo Treehouse Streaming 8 Hours on September 12th) and I made a lot of edits for the featured image that I felt was appropriate for the article. After I was satisfied with the end results, I logged off from Word Press and noticed that the featured image (and the featured slider) from the article was gone?! Once I logged back on, the image quickly showed up. I tried deleting it and reissuing as the feature image/slider -- but the problem is still there when I log off. Is this some kind of glitch or something? Is there a limit to how much content can be utilized, since I am using the free version after all? My blog's URL is: www.nintendounite.com