Variable products, front-end choices not working?

Hi,

As you can see here: http://bootcamp.bonsaimedia.nl/product/mens-running-jacket/ we have a product in Woocommerce with 2 variable “properties/attributes”. But for some reason we can’t select them both…

The customer needs to select a “Color” and a “Size”. Also see the screenshot of the settings we have made. That should be right. We think, perhaps, a bug with Unicon??

Screenshot settings product: http://imgur.com/a/bPCyp

I hope to hear soon.
Greets Dominique

Ticket