Since Firefox is running Proton, everything you do through Firefox is Proton. Turn off the Proton extension and try again. It should show Mulivad.

Also, to get around the browser situation, try the following command in Terminal. It should be Mulivad:

curl ifconfig.me

Be sure to try it with a rent or mortgage payment.

Namecheap and Cloudflare.

I use a bash script and cron to update Cloudflare using the following:

https://github.com/NChaves/Cloudflare_DNS_API_bash