Need help for blog commenting

most of high pr blog site don’t show backlink in website while i commenting on dofollow blog site.when i put mouse cursor on name that is show only name and date but don’t show website.
but why?

AFAIK browsers differ in what they show upon mouseover. Some may show the href attribute value, others (such as the one you’re using) show the title attribute value.

As long as the link goes to where it’s supposed to, what does it matter?

This is because that all the moderator know that, mostly people comment to make bakclinks for their site, so that’s why moderator, don’t make your site link live.