This might be a bug but my guess is something else is going on. My Arqade user card shows all five links that I have setup. Unfortunately my Stack Overflow user card only shows three of the links.
Here are some screen shots to illustrate:
The content of the two About Me sections differ. My bio on Stack Overflow is significantly longer and makes use of the
<!-- summary: --> flag. The link code is identical on the two sites:
[Twitter] [Facebook] [Google+] [CV] [Blog] : http://twitter.com/ahsteele : https://www.facebook.com/ahsteele : https://plus.google.com/117377867595475228062/ : http://careers.stackoverflow.com/ahsteele : http://www.steelebit.com
Why are the links of my cv and blog appearing on Arqade, but not on Stack Overflow?
Edit: I changed the tag on this question from support to bug. After playing with my profile the length of text entered definitely affects the links that appear on the user card. In fact using just using the
<!-- summary: --> flag will cause the links to break. I am sure the code to parse all of this is relatively gnarly, but it is broken in its current form.