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Might be because "Access-Control-Allow-Origin" is listed twice in your headers and this can cause an error?
Thank you for contacting us. Apologies for the inconvenience. I would suggest that you send your questions with regards to API through email@example.com so they can properly address your questions.
You can also use this contact form to send your questions about API http://api.jotform.com/docs/#contact.
"There can only be one Access-Control-Allow-Origin response header, and that header can only have one origin value."
I sent the API team an email and the screenshots. I imagine I'm not the only one having this issue. Thanks!