priority group not working

There is no limit for connections. This VS has 2 pools. based on incoming URI it redirect to the pool. Below is the config for pool. priority group not working for both pool

Pool1

ltm pool ULPRD_Invoker_Pool {
load-balancing-mode least-connections-member
members {
    10.20.153.164:trivnet2 {
        address 10.20.153.164
        priority-group 3
        session monitor-enabled
        state up
    }
    10.20.153.164:8202 {
        address 10.20.153.164
        priority-group 3
        session monitor-enabled
        state up
    }
    10.20.153.164:8203 {
        address 10.20.153.164
        priority-group 3
        session user-disabled
        state up
    }
    10.20.153.164:lm-perfworks {
        address 10.20.153.164
        priority-group 3
        session monitor-enabled
        state down
    }
    10.20.89.167:trivnet2 {
        address 10.20.89.167
        priority-group 1
        session user-disabled
        state user-down
    }
    10.20.89.167:8202 {
        address 10.20.89.167
        priority-group 1
        session user-disabled
        state up
    }
    10.20.89.167:8203 {
        address 10.20.89.167
        priority-group 1
        session user-disabled
        state up
    }
    10.20.89.167:lm-perfworks {
        address 10.20.89.167
        priority-group 1
        session monitor-enabled
        state down
    }
}
min-active-members 2
monitor tcp

}

Pool2

ltm pool ULPRD_XXXX_Rep_crys_doc_Pool {
members {
    10.20.153.164:xprint-server {
        address 10.20.153.164
        priority-group 5
        session monitor-enabled
        state up
    }
    10.20.89.167:xprint-server {
        address 10.20.89.167
        priority-group 3
        session user-disabled
        state user-down
    }
}
min-active-members 1
monitor tcp

}