Browse to an interface page for a node. On the page, you can see a list of polling packages which the interface & node matched the filter on.
If the interface had services which were found in the polling package, a is added to the end of the polling package name. This isn't very intuitive as to what it means. (There is no help text on the page that explains why the is there or not.)
Instead of using a , list the services that were found in the polling package.