problems with directions

Hello All

i am using a arduino mega 2560 with a ramps1.4 driving DQ542ma"s, when i use the manual controls and move the y axis positive it moves, then i try move the y axis back and the z axis moves?
I have checked the wires, there is only two from the board for each axis to DQ541ma.
I have read some where it might be the firmware version is older for my board? can this be, if so where do i get the lasted firm ware.
I have disabled  all   the end stops.

Please help



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