Coldet - collision normals problem

I'm hoping someone has used coldet here.

I've replaced my Blitz3d collisions with Coldet. Collision detection works fine, however the collision normal on impact seem wrong.

Please try this, adapted from demo1
(Push the up arrow key to move the sphere into the box)

;DEMO 1
;Dymamic mesh to static mesh polygon to polygon collision.

;Include helper functions and needed globals
Include "coldet.bb"

Graphics3D 800,600,0,2

;activate some global variables
coldet_start()

cam=CreateCamera()
MoveEntity cam,0,3,-5
light=CreateLight()


;------------------------------
;this will be the dynamic mesh
ob1=CreateSphere()

PositionEntity ob1,0,0,-3
ScaleEntity ob1, 0.5, 0.5, 0.5
EntityColor ob1,255,255,0
EntityAlpha ob1,.75
EntityFX ob1,16

;this is the static mesh
ob2=CreateCube()
RotateEntity ob2,0,0,0
ScaleEntity ob2,1,1,1
EntityColor ob2,255,0,0




;Make the coldet models and get their pointers !
;Careful ! Do not use by mistake blitz's pointers.

c_ob1 = coldet_make(ob1,1);1=dynamic
c_ob2 = coldet_make(ob2,1);0=static

;------------------------------

PointEntity cam,ob2

While Not KeyHit(1)

RenderWorld()

;Update your coldet's dynamic object matrix only when it moves or rotates

If KeyDown(203) TranslateEntity ob1,-.02,0,0:coldet_setmatrix(ob1,c_ob1)
If KeyDown(205) TranslateEntity ob1,.02,0,0:coldet_setmatrix(ob1,c_ob1)

If KeyDown(200) TranslateEntity ob1,0,0,.2:coldet_setmatrix(ob1,c_ob1)
If KeyDown(208) TranslateEntity ob1,0,0,-.2:coldet_setmatrix(ob1,c_ob1)

If coldet_collision (c_ob1,c_ob2);if a collision occurs between model1 and model2
	Text 10,10,"1"
	coldet_collision_point(c_ob1,0);get the collision point
	Text 10,20,"x: "+collision_point_x()
	Text 10,30,"y: "+collision_point_y()
	Text 10,40,"z: "+collision_point_z()

	Text 10,60,"tri1: "+coldet_colliding_tri(c_ob1,0);model1 colliding tri
	Text 10,70,"tri2: "+coldet_colliding_tri(c_ob1,1);model2 colliding tri
	
	coldet_colliding_verts(c_ob1,1,0);request collidong verts for model1
	
	Text 10,90,"nx: "+colliding_nx1();and aquire the normals of the colliding tri
	Text 10,100,"ny: "+colliding_ny1()
	Text 10,110,"nz: "+colliding_nz1()
EndIf


Text 200,0,"Cursor keys move model1"

Flip

Wend


;FREE THE COLDET MODELS FROM MEMORY !
coldet_free_model(c_ob1)
coldet_free_model(c_ob2)

;free global stuff
coldet_end()

End

In a Blitz collision, the Z normal would be -1

Any ideas?