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I'm assuming you're referring to this form https://www.jotform.com/61695467539169
The reason it's not showing the usual green lock on the address bar icon was because one of your images is being loaded from a non-https page:
Just remove that Comodo positive SSL image from your PAYMENT tab, and use the same image you used on the first tab COMPANY https://form.jotform.com/images/security_certificate_seal_positivessl.gif
That should fix the issue. Let us know if you'll need further help.