Images in Pages

So, I have come across something quite peculiar when trying to figure out why some images are not displaying on my blog pages. *It was working prior to 3.6 update*

The page in question is here

I am adding a link to an image file as follows: <img class=”files” alt=”” src=”https://www.chriswilcox.me.uk/blogimages/pdf.gif”&gt;

However, the image doesn’t show up on the page. I have set the correct permission for the file and set the correct .htaccess commands as I have hotlinking disabled.

When you look at the page info it is showing the link to the image as this: https://i0.wp.com/www.chriswilcox.me.uk/pdf.gif?w=700

It is only on the images of file types in my FAQ section. It is quite perplexing and I have no idea what the issue is.

I have moved the image to a different folder with no luck. I have deleted the <img> and saved and reinserted it with still no luck.

Just wondering if you have any pointers or suggestions.

Thanks in advance