If you look on the Users page you see a number next to the profile picture. What does this number mean as it doesn't look related to their reputation?
The default sort on
/users is by reputation, and the default time frame is the current month. The following screenshot shows the monthly rep gains by each of the associated users:
Additionally, the tags shown are the tags for which the user has earned the most rep in the time frame.
Select a time frame of 'all' to view the ordinary rep statistics.