Flip Z Axis

Hi all,I have a problem appeared recently, when I print the z-axis direction is wrong … and instead of bringing down the plane down, brings up qunado creates a new layer …

you have any idea on how I can solve?
If you try to perform a manual control with repeater … everything works perfectly
thanks

Did you use a STL you sliced yourself or an already slices gcode?

Does it happen with every project you’re trying to print?

Each project is to test I used a stl I have already printed but not working.

If the “manual control” of Repetier Do I Gcode:
G1 Z0.350 F7800.000
G1 Z0.750 F7800.000

The movement in the Z axis is correct!

The same commands launched a gcode printing, reverses the axis !!!

Why ??? What I wrong ?? there is some setting in the slicer?

What is your workflow while slicing and what programs and slicers do you use?