Spacing for BK2 axles?

[dbizzle5]

Hi all, Ive just got a secong hand X6 but when I tighten the wheel nuts it becomes unfree. It has the bk2 axles and has 1 bearing on the outside of the hub as it should but for some reason it has 2 bearings in the inner hub. Is this correct as I think this is where my problem comes from? How are you meant to space the axles and with what on the inner part?

Hope this makes sense!!!