Quote Originally Posted by Balaji View Post
My test site link which has the above said problem is here.

https://test.mysourcebest.com/zencart/

No other plugins were installed.

Kindly help / advise to over come this issue

Thanks
Please go to Admin->Configuration-> One Page Checkout Setting and let me know what you set for "Payment-Block Action on Shipping Change", and you may need to change it to update or refresh.

I see the issue, however let me know how you were able to remove the DOB entry! mine requires DOB entry. Also I checked it on Mobile and yours works well except the above issue, it will help me to figure out why mine does not work on Mobile, thank you.