Mikrotik with thunder cache problem with open dns service

I’m using thudercache on my mikrotik servers, but I have users using open dns 208.67.222.123
208.67.220.123 in their home routers, but when the thundercache works the filtering of the open dns will no longer working, the porn sites not blocked, I tried to add those ip’s to the thunder page but its not working either, is there any way to fix this?

I mean when you take the internet as a user from an ISP who are using thundercache then the open dns ip’s that you put it in your home (user) router will no longer blocks porn sites.
but when the same ISP stops using thunder, the home router immediatley begins to blocks porn sites when using open dns or norton dns ip’s..
its obvious that thundercache is doing some thing that prevent 208.67.222.123
208.67.220.123 from doing its job of blocking porn sites.. you can test it by your self.
I contacted thundercache support team, but no answers yet.
any help guys??
sorry for my poor english.