Wrong Obj.max.x values in camera Coordsys ( Matrix3)

(--start of script scope
 
if (yesnocancelbox "do you want to reset the scene? \n after reset a box and cam will be created and box size \n (in cam coordsys) will be measured" == #yes) do (resetmaxfile #noprompt )
 
	--declaring initial variables
local c_rot =0, max_x=0, min_x=0
 
	--Create a Targetcamera                                                                             
		--	(I copied the orientation/position from the target cam in my scene)
		tcam = targetcamera()
		tcam.transform = (matrix3 [0.579717,-0.814818,0] [0.515249,0.366583,0.774684] [-0.631226,-0.449097,0.632349] [0,0,0]) 
		tcam.pos =  [ -197.464, -140.085, 197.174 ]
 
		--Assign camera's transform.rotationpart to 'c_rot' variable
			c_rot = tcam.transform.rotationpart as matrix3
			format "C_rot = % \n" c_rot
 
			--create box (which will be measured by script)
				box1 = box length:100 width:100 height:100 --create box 
				box1.pivot = box1.center --center box's pivot
				box1.transform = c_rot --align box to camera
 
	in coordsys c_rot (
 
		max_x = box1.max.x --measure obj.max.x
		min_x = box1.min.x --measure obj.min.x
		delta_x =abs ( (-1* min_x) + max_x ) --calculate delta_x
		format "max_x =  % \n min_x = % \n delta_x = % \n" max_x min_x delta_x --print result (check listener/forum post)
 
	)--end in coordsys c_rot do
 
)--end of script scope