CMD_SHOW_ALL_USERS is missing some users.
The CMD_SHOW_ALL_USERS page is generated from a cache file:
This file can be recreated by typing:
echo "action=cache&value=showallusers" >> /usr/local/directadmin/data/task.queue
This file is kept updated by DA and is updated for any domain or user changes. This cache file is also recreated in entirety during the nightly tally. The single user updates only update thefile for that one entry.
Note, that you can also delete the show_all_users.cache file and load the "Show All Users" page. If there is no cache file, DA will generate the page on the fly, which will be slower and look slightly different, but it will give you a definite real-time look at who's on the system. The show_all_users.cache will be re-created automatically with the nightly tally, or with the above echo command.