Problems with Screen Time password

After updating my iPad OS, I decided to change my Screen Time passcode. After entering my Apple ID and password, I entered a new Screen Time passcode.

However, when I attempted to use the new passcode, it didn’t work. When I tried using my Apple ID to reset it again, not only did it not work, it also added to the “Failed Attempts” counter.

Is this a normal occurrence? If not, is there a way to solve it? Please note I only have this iPad, and no other Apple devices.