Persistence entries aren't mirrored to the standby unit when using iRules

I'm using source-address

it seems okay here.

 active

root@(ve11c)(cfg-sync In Sync)(Active)(/Common)(tmos) show ltm persistence persist-records all-properties
Sys::Persistent Connections
source-address - 172.28.24.10:80 - 200.200.200.111:80
-----------------------------------------------------
  TMM           1
  Mode          source-address
  Value         192.168.206.48
  Age (sec.)    5
  Virtual Name  /Common/bar
  Virtual Addr  172.28.24.10:80
  Node Addr     200.200.200.111:80
  Pool Name     /Common/foo2
  Client Addr   192.168.206.48
  Local entry

source-address - 172.28.24.10:80 - 200.200.200.111:80
-----------------------------------------------------
  TMM           0
  Mode          source-address
  Value         192.168.206.48
  Age (sec.)    5
  Virtual Name  /Common/bar
  Virtual Addr  172.28.24.10:80
  Node Addr     200.200.200.111:80
  Pool Name     /Common/foo2
  Client Addr   192.168.206.48
  Owner entry

Total records returned: 2

 standby

root@(ve11b)(cfg-sync In Sync)(Standby)(/Common)(tmos) show ltm persistence persist-records all-properties
Sys::Persistent Connections
source-address - 172.28.24.10:80 - 200.200.200.111:80
-----------------------------------------------------
  TMM           0
  Mode          source-address
  Value         192.168.206.48
  Age (sec.)    0
  Virtual Name  /Common/bar
  Virtual Addr  172.28.24.10:80
  Node Addr     200.200.200.111:80
  Pool Name     /Common/foo2
  Client Addr   192.168.206.48
  Owner entry

Total records returned: 1

is virtual address's traffic group set correctly (i.e. traffic-group-1)?

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
}