Have reviewed your install and all your plans seam to progress fine. I'm only failing registration in my tests on your form due to requiring an invite code. Aside from that it progresses.
The only time it wouldn't progress is when I left the Avatar field empty, which you've marked required. The avatar field then fails validation and won't submit the form. A validation error is shown below the avatar field, but it is popping back up to the top of the form. I recommend just not requiring avatar if you don't actually need one for your site. I recommend keeping registration as minimal as possible only asking what you absolutely need.
Please retry keeping in mind avatar is marked required and see if your issue persists. If it does please provide what browser you're using.
As for your radio buttons not display that's caused by your Joomla template. Specifically the below CSS.
IN: /templates/ensure/css/template.css
Code:
.form-check-inline input[type="radio"] {
display: none;
}
Suggest contacting the developer of your template or you can use CBs built in template overrides functionality below to try and apply a fix.
www.joomlapolis.com/blog/kyle/18711-template-css-overrides-made-easy
Example fix below.
Code:
.cb_template .form-check-inline input[type="radio"] {
display: initial;
}