mod_cloudflare not work

Hi
After installing mod_cloudflare, the apache log can record the real visitor IP address, but when I want to block some spam IP in .htaccess, it doesn't seem to work. How can I solve this problem?

I use Cpanel for another website. After installing mod_cloudflare, I can block spam IP in .htaccess, so I think the problem I experienced may be related to CWP. Has anyone experienced such a problem?