Buttons don't work (nothing loads)

Hi,

When I select a page through my menu bar, the portfolio item loads with no problems: http://lasharrugs.com/products/8×10/

However if I select one of the buttons by nimble, it just keeps loading and nothing ever appears.

Does anyone know how to fix this?

Also, where can we control it so that the buttons fit into 1 row, rather than split into several rows?

Thanks

https://wordpress.org/plugins/nimble-portfolio/