Ordered size not showing

[KMiDigital]

Hi, My problem is when someone places an order the PayPal transaction goes through fine but when it comes through to the back office there is no size showing for the item?

For example someone ordered a dress everything was fine but the dress size was missing, see screenshot, any idea why this should be happening?

 

If you look at the URL you can see how the sizes are laid out:

http://www.nsquarefashion.com/dresses/232-coral-sleeveles-pencil-peplum-trim-dress.html

 

Thanks