My jquery coding is not functioning properly on responsive design

My jquery coding is not functioning properly on responsive design

I'm redeveloping my website and it works as it should on one design but on desktop layout. it's URL is  http://xhpx.co.uk/under_development/ when it is using desktop.css it's only a part my jquery coding functions. please educate me on this regard and thank you very much in advance for your concern :)