The user profile features a diagram which shows the curve of "reputation vs. time". Here's a screenshot:
As you can see, the font size is ill-matched. At first glance, I thought larger font sizes indicate questions/answers generating more rep, but a closer look revealed that this is not the case.
status-completed
, since as per Hsien-Chih, it is not a bug but the site feature: the bigger one is the questions you've asked, the smaller one is the questions you've answered. $\endgroup$