I found out, that when I have a firewall rule that droppes everything (in forward mode) from a specific source to an specific outside interface (both check to be the right ones) does gives hits but does not drop (it seems) any traffic at all 
As soon as I add to the rule a protocol, it droppes the traffic for that protocol.
Does anyone know how this is possible and to make sure I can block all traffic instead of making rules for every protocol there is? 
When I do this simple arithmetic operation, the calculator does not give me the expected result, I only tell you that I press some keys.
Can you understand why?
And thanks to answer on 2015 from my reply.
http://forum.mikrotik.com/t/doable-adding-5ghz-to-rb2011uas-2hnd/85849/1
In other words, you need to show your firewall rules, because what you are typing makes no sense.