Is there a problem with your Captcha. I was trying to register on your website and the CAPTCHA won't allow me to select the images it is asking for verification. I am not using any kind of VPN and did open my browser twice. But, nothing works. Getting frustrated 
I had checked the captcha on the register page and there is no wrong with that all of it went to smoothly and the caused captcha don't appears or asking verification usually because of your connections so i think better to check again your internet connections whether it stable or not