SteemitBoard query

I am a little confused about the @steemitboard badges which @arcange has put together.

If I look at the signature I have it currently looks like this:

Yet if I follow the link to my steemitboard I get a different set of images.

For example, if I look at the Replies badge it looks like this:

If I right-click on the image and get the URL for it (http://steemitboard.com/@neilcrabbe/commented.png), when I paste that into a Steemit update it looks like this:

So why does it display one way on steemitboard.com, but another way in steemit.com?