I am assuming that the stable release is in use here on the CB site, as this is where I found the following. I'm also not so sure if this is a bug or not.

I used the 'All Members' list for this example;
The Search allows me to check multiple age groups, and carry out the search but returning negative results. Whereas, if only one age group is selected, the search yields positive results.

When using the Search facility, is it meant to be possible to select more than one Age Group at a time to carry out a search and expect to receive positive results from said search?