I always hear about a problem with CloudFlare HTTPS try to remove CloudFlare and also check the follow errors
Mixed Content: The page at 'https://mka.smartlaunch.pt/fuckup-nights-sign-up' was loaded over HTTPS, but requested an insecure image 'http://mka.smartlaunch.pt/images//c779b0d0446a33a94b4065201f97a607.png'. This content should also be served over HTTPS.
mtc.js:12 Mautic tracking is not initiated correctly. Follow the documentation.
mtc.js:10 Mautic tracking is not initiated correctly. Follow the documentation.