All Referrizer Landing Pages are hosted on a secured domain. If you are using our landing page on your own domain this will not automatically transfer.
You need to make sure there is a valid Security Certificate on your own domain, to make your customers feel more secure.
The security of websites is connected with their domain, not a host or builder. If your landing page URL has been forwarded/masked to domains owned by you those should be fixed to be secure (SSL certificate).
Here is a quick article on how to achieve this: https://support.google.com/domains/answer/7630973?hl=en
There are many more articles regarding this on the web for each specific domain provider.
All Referrizer sites have valid security certificates (SSL):
https://www.screencast.com/t/WZX6zHTcOODr
https://www.screencast.com/t/l8h13iNhZMwe
If you do not succeed on your own, please check with your domain provider if they can help you with the security of your domains.