Bug in Google Date Range Search

While researching the history of the word “twitter” on the internet we tried using Google date range option to find out why there was a peak of mentions of “twitter” in 2004, two years before Twitter.com launch. The search query looked like this:

http://www.google.com.au/search?q=twitter&hl=en&tbs=cdr:1,cd_min:2004,cd_max:2004&prmd=ivnsu&ei=sL87Tab-BYiXcbm89IQH&start=0&sa=N

And results:

We’re pretty sure most or all of the above are in fact wrong but unsure why it happened. Was it due to wrong server time or some type of meta data we missed? If you know the answer tweet this post with your suggestion.