I found a glitch at lfsworld.net.

Choose a player and go to his Online Racer stats (he must be racing online), click on the "Last race information" text and then on the host name that he's currently in.

Voila, the host doesn't show up in the list of hosts...

I noticed that a few times too.

fixed

Here's a similar bug, causing not showing the selected host - now after clicking on the 'O' beside a racer name from the chart.

thanks for the report. That's fixed now.