grid view not displaying as a grid

Hi, I have got grid view selected but I seem to be getting some very strange behaviour with this. I am testing this in your Simple Market theme in case it was my own theme ( where the same thing is happening) .

This is how the products page is displaying
http://www.saffronandsycamore.co.uk/store/products/
And when you click on an product image it doesn't go to the product either. I can't work out what I can have done wrong. Would really appreciate your help with this.

Many thanks
Jo