Ultimate Member Register form not working / Not showing a success message

I have created a register form and profile form in Ultimate Member plugin where I need to register users in specific user role.

I don’t know why the user can’t register successfully with the register form. When click on the submit button, same page is showing again. Even there is no error showing.

I also tried to deactivate all the plugins and activate them one by one by checking the register form. But still it’s not working. I have also checked with theme’s different versions but still, that’s not worked.

On same website, I created one register form before 3 month, that is working fine and showing profile too. For this form, user role is different but this older one working fine. I have added both profile shortcodes on user page just one after another.

I tried to make a plugin & theme conflict test, but the problem still appears. Kindly help me to fix it asap.

The page I need help with: [log in to see the link]