The IPv6 messages are normal. If there is no other error the rootkey should be Ok.
You can verify this also by adding verbose switch.
unbound-anchor -v
should print “success: the anchor is ok”
after some IPv6 errors if no IPv6 is present.
Is your clock working? DNSSec validation need the correct date.
Btw: the failing rDNS is not the reason for the broken dns. (the reverse DNS display need working DNS to display something).