Thanks Matt J. It was actually the margins that had lost their values and were throwing evertyhign off. I had set the sticky values up reasonably well to allow for the navbar but all margins were 0. Have resolved now. Thanks for your help!
Matt J. I'm struggling to get the radio buttons in form 18 to work. There's no documentation that I can see. Is there something I'm missing? I've published the site to my staging and not working there either.