Permalink Images not displaying

Hey,

I run this site
http://www.fresharsenal.com/

I have noticed some problems with the images. Sometimes I get a http error when uploading, I refresh and then it normal works.

I’m not sure if that is the problem, but then on my stream of posts http://www.fresharsenal.com/category/blogs/ – you can see some of the featured images are tiny white boxes – the featured images are at the head of the article when you open them up though? Not sure what the issue is – please help!

*Added – The permalink to article bit is the problem

On the articles where the permalink image does not show, this it doesn’t show the featured image in the post edit. It looks like this:
http://postimg.org/image/4yhdnhs9b/