Ok. Use the below code with uses getReference Callback. Since GlideRecord is not a good practice to use in Client Script. Run this and let me know, if there are still issues.
Also confirm there is no other UI policy or client script that is marking these field editable?
function onChange(control, oldValue, newValue, isLoading) {
if(newValue){
var grUser = g_form.getReference('staff_name', popCallerInfo);
}
//Nested 'getReference' callback function for variable access
function popCallerInfo(grUser){
g_form.setValue('u_job_title' , grUser.title); //set job title
g_form.setValue('u_department' , grUser.department); //set department
g_form.setValue('u_location' , grUser.location); //set location
g_form.setValue('u_contact_number' , grUser.mobile_phone); //use mobile phone field to set contact number
g_form.setValue('u_manager_name' , grUser.manager); //set job title
}
}
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