@ Paulin Halenria – I do not understand what the problem is. Please explain in detail what problem is occurring. When the problem occurred. What you were doing at the time the problem occurred. Post any Security Log entries, errors or email notifications. Also have you done the BPS Pro troubleshooting steps if applicable?
Are you saying that this custom htaccess code below is causing the problem? If so, use FTP and delete your root htaccess file. Then remove that code from BPS Custom Code.
<IfModule mod_headers.c> Header set Content-Security-Policy "script-src 'self' https://www.google.com" </IfModule>