Reply to Traktor S2 and Akai LPD8 Mapping

I am trying to map the Akai LPD8 with traktor s2 everything is fine except when i map the pads of lpd8 instead of turning on and off in toggle mode every time i press the pads, it does a strange thing, I have to press it again (twice) to turn the fx on or off, both in traktor mapping preferences and in akai lpd8 controller editor the pads are in toggle mode i dont know why it just can be turned on or of every time a press the pads, please help