I tried hard refresh (ctrl + F5) as well as clicking on the link again.
Matter of fact I tried on a different device as well. As in my mobile as well as my laptop.
Its weird since the issue is only for me. Tried different captchas on different sites and all are working fine except for the WoF.
If this captcha doesn't work for you on different devices, then the reason is most likely in your ISP. As an option, you can open a console in your browser by pressing F12, then you need to refresh the WoF page to see if there are any errors when the captcha hangs. In addition, you can also use the ping command to see if packets reach the captcha servers or not.