Test Import - User Statistics Broken
 

I've been running tests on importing user databases. First I imported my phpbb3 database and forums. Then after succeeding in that I imported my drupal database.

It says it imported 1532 users successfully from Drupal. I can go into the Moderator area, search for a username that was imported from Drupal (and was not present in phpbb3) and check out that person's profile. However, on the main page for the forums it lists 0 Users and 0 Active Users, despite all the imported forum posts properly having the imported users' names and profiles working correctly.

Did I do something wrong? I tried rebuilding all the counters and statistics, and repairing/optimizing my tables, and nothing fixed it. Is this a bug with importing two databases into one board?