Diagnostics my fault

Help Synology
1

Recently setup new isp modem/router and rebuilt pihole. However, I inadvertently put in a mac address in container settings that obviously wrong. “Can’t find where I put it.’ also getting a long-term load warning. Am pasting the two errors below. TIA

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2

You image doesn't show any MAC addresses.

The value 2001:4860:4860::8888 is the IPv6 (IP version 6) for Google DNS server.

You probably selected Google IPv6 in Settings > DNS page. The error means your network in not able to access this IP. You probably need to check IPv6 settings on your network.