x1 goes from 0 to 10 each row, that's why you get this effect when using it for
Y position. Try this:

#declare Obj = box{-1,1 scale<.9,.2,1.5>pigment{rgb 1}}
 
#declare x2 =  0;
#declare y1 =  0;
#declare z1 =  0;
#while  (z1 < 10)
	#declare x1 =  0;
	#while  (x1 < 10)
	object{Obj translate <x1+x2,y1,z1>}
	#declare x1 = x1 + 1;
#end
#declare x2 = 0.5 - x;
#declare y1 = y1 + .2
#declare z1 = z1 + 1;
#end

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