Precision

Ok... doing some testing with the CNC, just trying to figure out my
error in the building of the table.
My y-gantry works quite well, very straight cuts. I'm using a plasma
torch for the cutting system by the way. My problem is when cutting a
square two edges are perfectly parallel, but the other two are angle
(1/32" deviance).
So... is this problem in the x-axis? It usually occurs when it's going
that direction (table wise)
Any help would be great,
-Chris Clough
Xtech Engineering