Add to cart - product with one child - does not work

[77777]

Hi,
i have a problem with products with only one child,
example: http://www.maxxxoutlet.com/men-all/11170/230/menjacketsandsuitcoats/menjackets/lenny-loyd-man-suitcoat-17167hanoirouge-17167hanoirouge-detail

i cant see the add to cart button,
does anybody know where the problem can be?
Thanks

[jenkinhill]

Does it have stock level set for the size level that is shown - S ?  Your template is broken in Firefox 20