This could be due to caching or the DNS. On a Windows Server 2008 issue on Server Fault they suggest:
If they are resolving to IPv6 they might be cached or have ipv6 addresses registered in DNS.
You can also add a -4 to the ping:
ping example.com -4
Read full article from dhcp - Pinging own machine returns an IPv6 address instead of IPv4 - Super User
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