Why does my IPv4 address work when added to my cloud firewall but my IPv6 address does not?

I’ve added my IPv6 address to my cloud firewall but cannot access my droplet. However, when I remove that and add my IPv4, I can access my droplet. What am I doing wrong?

For example I add the following fake IPv6 to my cloud firewall I can’t access:


However when I add the following fake IPv4 to my cloud firewall it does:


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When setting up your firewall for ipv6 did you ensure that sources was set to all ipv6 and not only ipv4?