In first post review page mouse hover effect does not work for some users?

Question

I have seen the tool tip like popup for most of the users when mouse over the users but i am able to see this effect of some user.

Is it a bug or need some settings?

Do not show effect on :-

Answer 1

It is by design, as described on How does the User Card popup work? You can see it if the following conditions happen:

• The user reputation is at least 1000
• The About Me text is long enough
• The About Me text doesn't contain <!-- summary: &nbsp; -->
• The page you are seeing is a question and answer detail page, a page with a list of questions, or the users list page
• The question or the answer is not wiki

In any case, when the user popup is available, the user icon will be rendered with a border.