Weird logging stuff

For some strange reason from 20.59 to 2.0.60exp back to 2.0.59
the logging is picking up an IPv6ish
style number, example
1800:0:b0a4:d908:84a5:5748:987b:408 - - [24/Aug/2007:06:49:58 -0600] "GET http://www.sogou.com/websearch/corp/...y&searchtype=0 HTTP/1.1" 302 449 "http://www.netmory.com" "Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)"

What do I need to do to switch this back to IPv4?
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