403 forbidden error when cloudflare is on

Maybe someone who have experienced this with Cloudflare on their WordPress website can help with this.

The issue I am facing is that I have noticed that when I turn on Cloudflare I get 403 forbidden error when I run an HTTP header status curl.
The error will say “HTTP/1.1 403 Forbidden.”

The interesting part is that when you go to the website it loads perfectly on the frontend.

I noticed that some sites that use Cloudflare have it and some don’t(others have mentioned that they have seen this on some other websites and not others).

There must be a fix to this.

Can you help with how to fix this issue?

One of the wordpress is thehowandwhatwordpressnerd.com ( I turned off Cloudflare for now as a precaution so that search engine bots don’t see the errors and think there is an issue. I take this precaution because each time I turn Cloudflare cache on the ranking drops, and once I remove it everything returns within 48 hours. So I believe that this error is causing it as I have tested it on many sites and get the same results).