You should be able to see the challenged or blocked event under the Security tab → Events at Cloudflare dashboard for your zone and know exactly which security option was triggered. Could be Managed Rules my best guess, otherwise Bot Fight Mode or Browser Integrity Check.
Once you find them, click on a particular one to find more details about it (user-agent, IP, HTTP version …). If yes, could you share some details which service was triggered that blocked you?
Try disabling the Hotlink protection at Cloudflare:
Or add the Funnelkit visual builder IP addresses in IP Access Rules to allowlist with the action “allow”: