JQueryUI, Datepicker and Google Chrome

JQueryUI, Datepicker and Google Chrome

I'm experiencing a weird error on  http://www.pensiontracker.co.uk/pension/Scot Eq Mixed when running in Google Chrome. 

The page contains a form, with a dropdown box, a date field (with JQueryUI Datepicker) and a submit button.

When I click on the submit button in Chrome, it opens the Datepicker box.   In other browsers, the submit button correctly submits the form and reloads the page.

Any help would be greatly appreciated.

Adrian