Browsers can expose your real IP address through WebRTC even while a VPN correctly routes ordinary traffic - on both IPv4 and IPv6 independently. Connect to UrMomsVPN, then run this dual-stack check - it's the same kind of test some other VPNs charge extra for.
This only checks your browser's WebRTC stack - it says nothing about the UrMomsVPN app itself, which doesn't use WebRTC. Run it while connected to see your VPN's exit IP show up on both lines below.