Screen time password won’t update after changing on my iPad running iOS 18

I updated my 13 Pro Max and my son’s iPad to the newest iOS 18 update. I changed the screen time password because he figured it out. He is still able to put the old password in and work for apps. I went under settings, the new password works! Also on the iPad changed the screen time password twice and getting the same problem. I believe this is an iOS 18 issue as this has never happened before.

[Re-Titled by Moderator]