Ramps 1.4 no reverse extruding

Hi, i changed my printrboard for a ramps 1.4 with stepstick, I am almost good but...
When I try to extrude or /reverse the moto spin in the same direction
I try to plug the motor into the x axis slot, and I was able to move it in both direction!
I also tried several stepstick I always got the same problem.
I think there might be a problem with the dir pin of the ramps or of the arduino, do you know wich pin is it?
If you think it could be anything else let me know!
thanks for the help!!!

It appeared that it was a bug in pronterface, it works well with cura!

How can it be a bug in Pronterface?

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Waitaki 3D Printer

I really don't know... i should try again to see if it works with pronterface now.
But for the moment the atmega16u of my mega board fried, and i can't use it ...