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It is highly possible that the form was having script conflict issue with the other existing scripts on your website. This was most probably the caused of issue.
Please try this steps for a fix:
#1 Remove the currenlty embedded form and all other code script of the form on the website.
#2 Re-embed the form on the website using now its iframe embed code instead.
You can test again the website if the form is now working properly.
Hope this help. Let us know if not resolve.
This works fine, thank you.
On behalf of Jonathan, you're welcome. Let us know if you need any assistance. Thank you.