If you're using Google Chrome, you need to disable Data Saver and asynchronous DNS. Google uses those two technologies by default and they interfere with Blokada's host blocking mechanism.
- To disable Data Saver, tap the three vertical dots in Google Chrome, go to Settings, search for "data saver" or "lite mode" and disable it.
- To disable Async DNS, open the page "chrome://flags" in your browser, search for DNS and disable the Asynchronous DNS feature.
- On your device, go to Settings -> Applications -> Chrome -> Storage and clear cache.