Not sure if its the same thing as your friends issue but I had to adjust the Home offsets when I finished my FT-5. When I would do a G28 it would end up in a corner instead of center.
I kept doing M206 commands till I got it centered.
example
M206 X50
I had to adjust both of them.
I got this info from here http://marlinfw.org/docs/gcode/M206.html