So I think if it was Java, the cloud flare icon wouldn’t have loaded, it just somehow never gives me the option to complete the box-tick.

It just happened today and never had the issue before. My phone is logged in so that’s no problem with the account, but it’s the verification step there that’s stuck.

Does it happen to anyone else?

Never had this issue once. If you're using a VPN, those have been notoriously known to cause a multitude of issues.