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I'm sorry for the trouble caused to you.
I did check your form and I am able to see the issue. Does the issue happens when you select the option in first dropdown field? Please check the screenshot below:
I would suggest you to please inject the following custom css code in your form and that should solve your problem:
width: 498px !important;
The following guide should help you how to inject custom css code: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes
Hope this helps.
Do get back to us if the issue persists.