Hi Justin, thanks for the feedback.
I'm not sure I would have been concerned had it just been a couple of links from the sites.
The sites linking are credible well established blogs, with great content. And the response on the sites are genuine unique responses in the comments section to articles created.
It seems to be the nature of the comment form and the set up of the blog plugin that makes this look suspicious.
I believe I will see if its possible to keep the comment and just remove the link.