I was really at a loss as UBBthreads is a simple PHP script that should "just work" on most standard systems, but Cloudflare isn't a normal standalone system so it's completely out of the scope of forum support, there are just too many rules that can do too many things...
Initially I was going to have you see if they had a log of actions they were performing since the issues looked like settings affecting their system (since the forum goes through their system before presenting to the user).
Honestly I'd never even heard of their OWASP rules, I just use them as a firewall.
