Code looks right, images not showing up

Pages with problems:
https://yourtownus.com/?p=26
https://yourtownus.com/?p=138

I did:I put in code for several images on different posts. There is a light box set up, and I’m able to scroll through all of the uploaded images.

I saw:
The problem is that some of the thumbnail images in the blog appear, while others do not. The html code seems to be exactly the same and it’s like there’s no rhyme or reason for them to not be there.

I expected:
Based on my knowledge of the code, it seems like the thumbnail images should show up. If they didn’t show up in the light box or I couldn’t find them on my ftp, I would think it was a file/link problem. Since wordpress knows the image is there, I just need it to show the thumbnail.

Also:
The site is basically under construction, and we were hoping to have it completed early next week. Any feedback you guys could give me would be great.