mx518 1000hz @ 2500hz? -_X

hi. I have a mx518 (1600dpi) and i use raziel patch (1000hz).Some day ago i check my mouserate and i saw that i have 2500hz +/-... is it good do have so many hz? or could it be bad, like hadrware for RMA or something? is it normal?

http://img325.imageshack.us/my.php?image=hz7zh.jpg