Hello,
We have built header using header builder, check, please.
We need an answer from your hosting provider with detailed information about locked requests not just to unlock builder but to allow you to use other options of the customizer and live edit http://prntscr.com/pc419z , understand? In other cases, these options will be locked for you once they enable the firewall again and we don’t have backend option anymore, all the settings were moved to the customizer. Maybe tell us what hosting provider do you use? We’ll try to contact them if you feel some inconvenience asking them these questions.
Regards