Have you set a site as "Not Allowed" but are still able to access it? Is a BedTime/OffTime not working? Pause doesn't seem to be on? There are a couple of things that could be going on here.
The website may be cached and is only showing previously saved data. Websites cache data to help your browser load faster. You can clear the cache on most browsers. After doing so, try to load the page again.
Save your changes
After making a change to your profile's filter settings, make sure to save those changes by tapping the "Save" button in the top right. Otherwise, Circle won't change them!
Check your settings!
Make sure your settings for the profile or device look correct and would filter what you mean them to. You might need to check your timing or the days you've set up for your BedTime or OffTime (and watch out for weekend differences). If you've set any categories or Platforms to "Unmanaged" realize those won't be Filtered even during a Pause! Check your Filter Level and make sure what you're trying to block is set to "Not Allowed". Finally try making a "Custom Filter".
Have the right profile?
Are you sure the device you're on is assigned to the right profile? Make sure the device is on the correct profile that has the filter in question set.
Wait just a minute...
Circle's filter can take a few minutes to take effect, especially if you're changing the setting away from home or for devices with Circle Go. This is because the new configuration has to be sent through the internet via our remote/VPN servers, which isn't as instantaneous as over your local Wi-Fi network. After tapping "Save", give your device a moment to propagate those changes.
If none of the above worked, try rebooting your router and then Circle to make sure their processes are all running correctly. After you've rebooted both wait a minute and see if your changes have made a difference.