Why does pure-ftpd put the root user?

Question

linux

Hello. I have a script that creates FTP users and gives them a group, rights. Recently I manually added a new user with the following commands:
sudo groupadd 100
sudo useradd u100 -u 100
sudo chown -R u100:100 /home/100
And restarted pure-ftpd itself.
And now all new FTP accounts are created with the root user. Please tell me what's wrong)

Answer 1

maybe you need to run the script on behalf of useradd

Answer 2

Problem solved.
I specified in the script to create a user with id 10500 and everything worked (it was 10000)