I found that a number of UIDs are not linked to a profile and so that could push the number up while keeping the number of users down. If you start at UID 2 and try to go up, you'll see that a couple users' profiles do not exist. Now this even continues on in the 1000 range (i.e. UID 1101, 02, 03) so I assume this is where the disparity comes from.



Just to save you guys time for your own personal investigations: https://bitcointalk.org/index.php?action=profile;u=1103