USG9560 cannot be active-active mode

USG9560 cannot be active-active mode as below:

=============================================================

  ===============display hrp state verbose===============

=============================================================

2017-12-24 22:15.890

 Role: standby, peer: active (should be "active-active")

 Running priority: 47004, peer: 48004

 Backup channel usage: 0.00%

 Stable time: 0 days, 0 hours, 40 minutes

 Last state change information: 2017-12-24 22:15 HRP core state changed, old_state = abnormal(active), new_state =   abnormal(standby), local_priority = 47004, peer_priority = 48002.

                Both Firewall version: V500R001C60SPC300

                Device configuration:

                Firewall_1:

 hrp enable

 hrp interface GigabitEthernet2/0/0 remote 10.0.17.2

 hrp mirror session enable

 hrp track bfd-session 10

                Firewall_2:

hrp enable

hrp interface GigabitEthernet2/0/0 remote 10.0.17.1

hrp mirror session enable

hrp track bfd-session 10

 2017-12-24 22:15 HRP link changes to up.

 2017-12-24 22:15 HRP core state changed, old_state = abnormal(standby), new_state = abnormal(active), local_priority = 48002, peer_priority = 47004.

 2017-12-24 22:15 HRP core state changed, old_state = initial, new_state = abnormal(standby), local_priority = 48002, peer_priority = unknown.

 2017-12-24 22:15 HRP link changes to down due to command disabled.

 2017-12-24 22:15 HRP core state changed, old_state = abnormal(active), new_state = initial, local_priority = 48002, peer_priority = unknown.

Check the log, the priority is 1000 higher than another.
                Check the version, it matches.

Check the configuration, it is okay.

                Check the hardware, there is something wrong as below:

Firewall_1:

Firewall_2:

The hardware does not match cause different priority.