I'm also a Tor user for mobile; I just tried accessing the forum through it right now, and everything works perfectly. The cloudflare verification went smoothly the moment I clicked on prove I'm human; there was no more delay.
Connection to the forum via Tor can work smoothly like at the time you did it but it can not work at different times, like recent days. It's harder to connect to the forum with Tor, and when you try to log in your account with Tor, you will have more problems.
Things are better now, today, I can confirm it because I log in easily than yesterday and by that, I can make this post.