Hi. It is not related to SP Page Builder. The same thing will happen if you add your code to any Joomla editor not related to SPPB.
Therefore, you are in the wrong place to solve this problem. You need to add your IP address as an exception in the RS Firewall settings. Or if your IP is dinamic, you need to add it to the RS Firewall exceptions each session of your Internet connection.
Perhaps there is another solution, but all this is on the side of the RS. Read RS Firewall documentation. Or contact RS support team.
And just advice, do not use what you do not know how it works. Many of my clients got rid of RS Firewall when they realized that they did not have sufficient qualifications to work with this. Web safety engineer skills are required to use RS Firewall. In the absence of skills, this causes only fear, misunderstanding and load on the system