I don't know what the problem is, but I cannot register on the site. The fact is that the resource does not accept my e-mail and after that I cannot log in using the data for registration. I tried to use a VPN but it didn't help. does this resource have regional restrictions?
I tried it using different IP's and it worked fine for me so I do not think it has regional restrictions.
Although the website is quite slow and laggy so that might causing the issue you are having. Try registering again with different email, it might work.