Steps to reproduce:

1. Go to Configuration -> Hosts.
2. Go to Graphs page of host "Zabbix server" (host selected as "Zabbix server", host group as "all").
3. Select another host group, e.g. "Templates" (in right corner).

Result:
Host group changed to "Templates" and host now is selected as "all", but graph list is left from the previous host
Expected:
Graph list updated according to selected host group.