403 status code when Cloudflare enabled

Hi, My website meditatieinstituut dot nl (I cannot write url’s) gives a normal 200 response code. But when I turn Cloudflare on, I receive a 403 response. I now have Cloudflare turned on. The website is working fine but when you check at for example httpstatus dot io you can see it gives a 403 response.

I have no clue what to do. Any suggestions are welcome.

Thank you!