Somehow, my X axis went negative.
It was very interesting. Both +X and -X moved the gantry in the same direction. Rebooting did not reset the X axis. The fix was to use the ‘Fix Length X’ button which sorted it out.
I would suggest a bounds check that prevents the X axis going negative (Unless the Negative coordinates toggle is set)
Happens to me too when testing software things . . but I use a “headless” Farmbot (no motors connected).
I just ask the device to seek (0,0,0) and all’s well again 
Interesting.
When in the negative state, the X+ and X- buttons would move the head in the same direction.
I don’t think I tried 0,0,0
I will remember that.
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