3D solid warps on oddly on a Z rotation

I've browsed the internet looking for an answer to this peculier problem which is: Whenever I convert a flat solid layer to a 3D object and then try to rotate it on the Z axis, it begins to stretch the object on the X axis. When I return back for a full 180 degree turn, it returns to it's normal size and ratio.

I have found other people with this problem, but I haven't found a clear solution on how to fix it.

Help would be appreicated.

I'm using CS6 on Adobe Creative Cloud and I'm running on Windows Seven.

Thank you very much.