There is a JS error being thrown on your site which will break the validation on the checkout page. Its being thrown from some JavaScript being used within your theme – http://take.ms/pXsL0
Can you check if there is an update available for your theme?
Note before moving forward be sure to make a full site backup which includes the database and all files. If your theme has been incorrectly modified previously then you will lose those modifications when you update.
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