Users from China are not seeing the recaptcha on the page as it’s being served from Google servers which are blocked in China.
Since they don’t see it they can’t complete validation and they can’t submit the form.
This is a known issue https://github.com/google/recaptcha/issues/87
The solution seems to be to change the servers from google.com to...
One trend I am noticing more and more is customers wanting to create their own web forms. The problem being in the past was that forms in BC were not very user friendly and to be honest, you really never wanted to have customers touch them (or maybe that was me - lol!)
I really like the drag-and-drop functionality...