Content and privacy is not blocking key adult sites even when i add then to the block list

I have gotten my mac to block most adult websties but there is one that will not block - *********. This is a picture site that has **** categories. I have tried to block this site in a number of ways but for some reason my mac won’t block the sites. Now Safari is in safe mode, so that works. but if I used Chrome or Duckduckgo browsers - it does not block them. All other sites i have entered are blocked. I just can’t understand why when I add this to the list of special blocked sites it does not work?

Can someone help or who can i contact at Apple?

David

[Edited by Moderator]