poly to subd - subd to poly
 

hello all
please help
I have made a polygon face in maya, after it was completed somehow, I converted it to SUBD to smoothen some part.
then I wanted to convert it back to polygon, but it is a different shape now. it is of course a polygon face but much much smoother way kind of similar to the SUBD and it's not what it was before. it was not used to be like thins but I don't know what happened. does anyone here know what should I do to fix this and perevent this event.

you must open the option box for sub to poly and then make sure the little dot thing is at Vertices and lvl 0