htaccess entry keeps disappearing

Support,

I installed WP-Cerber to protect against CVE-2018-6389. I see the entry in .htaccess and when I test the vulnerability it successfully blocks the vulnerability. But it only seems to be temporary. Next day our vulnerability scanner flags the issue again, and the entry is missing from the .htaccess file, even though “Block unauthorized access to load-scripts.php and load-styles.php” is still checked in wp-cerber. If I click save, the entry gets written to the .htaccess file again. Then next day it is gone. Is there anything I can do to make the protection permanant?

Thank you