Required checkboxes are not working in firefox

Users are not able to submit their response when they select only one checkbox and the question is required. 

https://www.jotform.com/build/80095587114156

I checked your form https://www.jotform.com/build/80095587114156  but there isn't any checkbox field there so I'm not sure to which field are you referring to?

Please let us know if you need further assistance.

Thank you!

Jotformforum_1410383,


Thanks for emailing ODDT. 

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