Contact forms not reacting / sending

Hi all.

Since I use Cloudflare for my own websites, I notice that the contact forms no longer send. It just redirects to my homepage with no confirmation at all. Now I have tested this on two websites with different builders, and I notice that the problem is present on both websites that I use Cloudflare on.

Does anyone know how and what I have to do to get the contact forms working? I’m almost assuming this is due to a setting in cloudflare as I’ve never had this problem until using cloudflare.