dual YY axis problem

ah, im not can make this working if use MDI add G0X50F100 etc, move ok but all axis same problem if use GoX-40F100 any axis not move minus to back .
i not understand this any now. or move manual continue, selected axis X or Y or Z move plus + side but NOT minus - side newer. if try minus come sometime errors lot. exceed joint 1 and 2 and somethink i not know what errors mean.
and last night has workshop i delete machine my name config conf file not know were file go i not found. maybe all need do again new at config wizard now. but i not understand have this right table size and limit system. why linuxcnc not have option can select XYZ or XYYZ or XXYZ not have but have only shit XY or XYZ foam or lathe or custom.