The widgets Host status and System status have rows for every single host group, unless those excluded via a dashboard filter. Consequently there are also lines for host groups that don't have any hosts with issues at all and they have the same hyperlink to tr_status.php?groupid=x. Unfortunately, when no triggers exist in this host group, you eventually end up with the host group dropdown set to "All". This is extremely misleading, as you are considering yourself to be looking at the selected host group.

This issue is related to ZBXNEXT-2819, which allows for an option to remove such lines on a per-user opt-in basis and ZBXNEXT-1632, that worked around a similar oddity.

I guess the options are to either remove the hyperlink, remove the rows in the first place or to show an empty results page.