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One is probably link local the other is global, that’s pretty normal. https://en.wikipedia.org/wiki/IPv6_address#Address_Scopes
one my openwrt router WAN IPv6 shows 2 IPs. IPv4 does get linklocal though
Are both subnets public?
one is 128 and other is 64
Are both of them ula addresses? (both of them starting with 2). If they are not the same then the ISP is providing an internal unique address for isp internal configurations.
If so, are they having the same network? ( The first 48 bits) if not, then is probably a miss configuration but probably in their side. But with no practical effects. You could ignore it.
If yes again, then it is a miss configuration and it shouldn’t happen, but this time it could be in your side, check that the dhcpv6 daemon doesn’t try to give an ipv6 address To your Wan port
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How can I tell if IPv6 is CGNATed ?
It all is if you’re getting both. You’re sharing IPs with many different devices at the same time. That’s how it works.
Read up on it.
