What I've noticed since this month, Everytime I click the login button, nothing happens. The site loads and just brings me back to the homepage. So what I do is I manually edit the website link and add "/login/" at the end and click it then it brings me to the login page. I'm not sure if others are experiencing it too but I've been thinking that maybe it's because I'm opening it with my smartphone. This is not a complain. Just my experience on the website with the phone.
I think I figured out why that's happening. It requires editing one of the core xenforo files. It should be fixed soon.