Zoho Desk Web Forms Embedded to Zoho Sites | Captcha Image Issue

Zoho Desk Web Forms Embedded to Zoho Sites | Captcha Image Issue

Good day Zoho team,

I created a web form in Zoho Desk and embedded the code to Zoho Sites under the Contact Us page in the website.
The web form consists the ff.: First Name, Last Name, Email, Phone Number, Description, and Captcha.

In Zoho Sites, The captcha image is broken when opening the page. I still have to click the captcha refresh button in order to get the captcha code.
Please see image:


But when testing it in local only, the captcha works fine without the need of clicking the captcha refresh button.
Please see image:




 Can you check with this issue? What could possibly be the error?
I did several debugging but wasn't able to fix it. I think the issue is on Zoho Sites? Please let me know. 

Best regards,
Lizz