reputation downgraded from 18 to 14 for no reason, strange

first i lost my reputation i directly jumped down to 16 from 37 for copy pasting some of my blogs . at that time i was not aware of the rules and i take cheetah bot not seriously that was a mistake but after that i started making my own blogs and came to rank 18 . and i was doing well but i drop 4 ranks down again today .
please guide me if i am doing something stupid . your help will appreciated .