superadmin
Co-Owner
Superadmin
Head-Admin
admin
Moderator
TrialMod
trusted
user
From your example description, you state one inherits the next below.
If your script is set for admin only, then the groups below admin in your list should NOT be able to spawn/do admin stuff.
However, you then state;
They do inherit admin.
Which is it?? Does your inheritance tree look like your list top to bottom, or do Moderator and Trial-mod inherit admin.
If they inherit admin, that is why they can spawn.
If they do not inherit admin, it's possible you have an issue with Fadmin or another conflicting addon.
Have you disabled Fadmin?
While your server is running, with a Moderator or trial mod on, please run "ulx debuginfo" from your server console.
It will output a file and tell you where it did.
Attach that file (using the attachments and other options link) to your next post.