Hi. That's not an error. Here's how it works...
1. no site was specified on the demo page so search all sites available
2. found results and now the default site is phpdig.net so just search it
3. found results so give option to narrow search to a path within phpdig.net
4. no results found for the selected path so go back to the default site
5. found results so give option to narrow search to a path within phpdig.net
6. no results found for the selected path so go back to the default site
If you don't like the dropdown menu, just turn it off in the config file.