After promoting an admin the users.txt will list him as admin. If that person leaves the users.txt still lists him as admin. But when he joins the server again he will be automatically listed as user.
autopromote settings are as follows
"set"
{
"ap_effect_enabled" "1"
"ap_snd_scope" "1"
"ap_auto_demote" "0"
"ap_snd_enabled" "1"
"ap_enabled" "1"
}
"grp"
{
"Owner" "-1"
"superadmin" "-1"
"admin" "-1"
"operator" "-1"
"Respected" "100"
"Builder" "25"
}
owner inherits from super -> admin -> operator -> respected -> builder from user
EDIT: I forgot to specify that the users.txt i was talking about is the one located in the data folder and not the gmod vanilla users.txt located in settings. The vanilla one has not been touched.
EDIT2: The issue was most probobly caused by a conflict between ulx and the starfall processor, as the issue seized to exist after i removed the starfall. Thanks.