Host-name of the system differs than HA configuration

1- i have an issue that, the host-name of standby device at the HA configuration differs than the real system host-name (which exists at the system--platform), although both devices insync

is this helpful?

Chang device name using tmsh

2- also we had an issue that the standby handled a traffic once for specific VS (not all Virtual servers)

is virtual-address' traffic-group setting correct?

e.g.

root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual-address 172.28.24.10
ltm virtual-address 172.28.24.10 {
    address 172.28.24.10
    mask 255.255.255.255
    traffic-group traffic-group-1
}