Looking at the image URLs with Web Developer Tools, I see that they now have the .svg extension, which is good. However, the ampersands in the query string have been replaced by the HTML entity for displaying an ampersand. When I looked at your code, I didn't see this, but it might be caused by publishing your comment in the HTML format. Try using the Markdown format instead, and reenter your ampersands.
Looking at the image URLs with Web Developer Tools, I see that they now have the .svg extension, which is good. However, the ampersands in the query string have been replaced by the HTML entity for displaying an ampersand. When I looked at your code, I didn't see this, but it might be caused by publishing your comment in the HTML format. Try using the Markdown format instead, and reenter your ampersands.