I test my privacy behind VPN with your website and you can Geolocalisation me without trouble

and the IP address showed is my IPV6 address, but IPV6 is disable in my network setup ?
If I do the same test with firefox browser you can't localise me, but with chrome yes and all geolocalisation option is disable in my chrome browser !?
WTF ?
thanks in advance to help me with that privacy trouble
Hank