Product parent ordered

good morning
I have a problem with the template hot_furniturestore the add to cart button on the parent product, even if I set the custom field father ordered the product you can order, changing template with beez_20 this problem disappears.
I enclose two photos.
thanks

send your link so we could inspect source

Thanks for the response.
the link is www.sexintimo.com
joomla version 2.5.6
virtuemart version 2.0.8e

what step should i take to produce that problem

the product that has the problem is of catalogo/abbigliamento/accessori/peephole bikini, Click "aggiungi al carrello"add to cart there must be, in its place, there must be "scegli la taglia" choose size (not sold).
thanks.

I don't understand what is the problem, i see both attribute selector and button, i can select size and when i click add to chart button it works normally? What am I missing?