trends problem with hosts

My hosts.cfg file has below entry.

1.2.3.4 server1.server.example.com #
http://server1.server.example.comCLASS:PRD_APP NAME:server1-prod

I can see the graphs on each page with no problem and on trends page as
well.

But when I want to see the graphs with Today, week, month etc. I see "no
such host", because on the url contains "server1-prod" instead of the full
name of the server.
I need to append the url with the full hostname and then it works fine.

Can anyone tell whats wrong and how can I fix this?

Thanks,
Deepak