Cant figure out how my IP address is leaking, only on whoer!

Hello, I’ve recently discovered that for whatever reason, whoer.net is able to detect my actual IP address while im using socks5 proxies or a VPN. Every other “ip check/DNS leak” site doesnt detect my actual IP. This is the first time I’ve truly been stumped as to whats causing my IP to leak.

I’ve tried using the hardened firefox privacy config, my own config (which has always worked), new profiles, ethernet/wifi, DNS settings, DNS flushes, even have usede a VPN with a socks5 through proxifier over top. The strange thing is, it will randomly not detect my IP sometimes, but if I refresh the page, its back to my leaked IP. I have my DNS going through cloudflare at the moment, my routers DNS settings as well.

Any ideas or help would be greatly appreciated thanks!

Edit: I’m currently using windows, mullvad VPN, proxifier for proxies.

2 years late but profile → name resolution → resolve hostname through proxy

Thanks I’ll make sure. Those are all in about:config besides the registry edits right?

Those are all in about:config

No, they are commands to run on the command line.

yep saw the edit, thanks though!