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I checked your jotform http://www.jotformpro.com/form/52193549896977 which I presume was the one having issue with the Terms Conditions widget, but I could not produce the described issue yet.
When I checked on my browser, it is not difficult to discenr the checkbox of the Terms widget... I can easily see it and use.
Can you tell us the correct form if in case I was checking the wrong one.
You can also take a screenshot image of the issue on how it looks on your end, and we will check for more details.