Why blocking sites in OpenDNS does not work?

So, I have Asus WIFI router, which uses 208.67.222.222 and 208.67.220.220 DNS servers. My devices have 192.168.1.1 DNS server.

I added some sites in https://dashboard.opendns.com/settings/. Previously it worked correctly. But now I can open this "blocked" sites from devices. I really don't know, why I can.