fftn of a 3D scalar field

I preformed fftn() on a 3D symmetric matrix, only to get non symmetric result, that is I started with a matrix 27x27x27, and finished with 27x27x27, but it looks like beside the first column and row - Its all symmetric and as it should be, like if the result was 28x28x28 everything will be in it's place.

WHY?!

thanks a lot Uri