Timely Calendar and Tablets

I am currently using the Standard Calendar plugin for the first time at http://kalmababy.co.uk/classes/ for a client of mine. All looks great until I tested it on a Samsung Tab and a Samsung phone. It renders fine but both the Calendar View and Categories button /drop downs are unresponsive I have tried this with different sites and themes (currently using WooThemes Canvas theme)

Any Idea why this might be happening?