Enter valid date with embedded form

We have a form that uses the Date/Time quick tool. When it is embedded (using iframe option) in one of our pages, Aug and Sept dates picked from the calendar return "Enter a valid date" message. When using the direct link to the form, dates validate correctly. https://form.jotform.com/52565419679975

I was not able to replicate the problem in FF or Chrome, however, I see the page have some jquery libraries, so if the problem persist in your end, remove the code between <script> tags that is rendered with the iFrame method.