Unable to capture checkbox when selected in a ticket form

[Bassel-Nasief]

Hello guys.
I've created a custom HTML form for the sake of ticket submission depending on these two articles provided in the zendesk website:
1- https://support.zendesk.com/hc/en-us/articles/203660576-Creating-a-Custom-HTML-Form-for-Ticket-Submission
2- https://github.com/apanzerj/Former-For-Zendesk/tree/Addendum-Custom_Fields
Everything is working fine, except for the checkbox selection. I've create a checkbox (custom ticket field), captured that custom field id, followed the same procedure provided by the second link (about supporting custom fields) and then when selecting that checkbox in the popup ticket form and hitting the submit button, the checkbox is not captured and displayed as if it's not selected when viewing the ticket sent.
Could anybody help me regarding this issue??!! It's an urgent issue.

The following two screenshots could help in understanding what's going on:
1- http://tekno-side.com/demos/ticketing-system/submitted-ticket.png
2- http://tekno-side.com/demos/ticketing-system/received-ticket.png

Thanks a lot in advance.

[apanzerj]

Sorry, just saw this. Lemme take a look.

[apanzerj]

Is there somewhere this form is hosted that I could test it out? Perhaps a JSFiddle? I don't have this code set up anymore.