Hi,
As i am seeing you have modified this PHP file:
/templates/YOUR_TEMPLATE/component.php
your template doesn't load the <head>...</head> content properly. (which includes the MooTools, jQuery and all the required JS files -- such vmsite.js, validate.js etc..) those JS files are required to run the form validation and everything. Without them, the registration form will be a plain HTML)
Attachment Pasted_Image_3_5_14__4_45_AM-5.png not found
But this line:
<jdoc:include type="head" />
should do it. I don't know why this line doesn't do his job in your Joomla Template. Did you recently change anything or modified the /component.php file?
Regards,
Support