Help with JSESSIONID persistence

I also persist for some times and without me doing anything bigip deletes the entry in persistent table, and then next request is forwarded to different node (say 1.2). I am not deleting JSESSIONID, if I wait for sometime BIGIP again deletes persistence entry for 1.2 and recreates new entry for 1.1 after next request. I think 3600 should be the timeout for bigIP, which means an hour ??

Here is the configuration for my virtual server:

VIRTUAL ADDRESS 17.184.8.110   UNIT 1
|     ARP enable
|     (cur, max, limit, tot) = (0, 5, 0, 51)
|     (pkts,bits) in = (4912, 5.243M), out = (17229, 77.93M)
+-> VIRTUAL vs_uie_appserver   SERVICE http
    |     PVA acceleration none
    |     (cur, max, limit, tot) = (0, 5, 0, 51)
    |     (pkts,bits) in = (4912, 5.243M), out = (17229, 77.93M)
    |     requests (total) = 374
    +-> POOL test_uie_pool  LB METHOD round robin   MIN/CUR ACTIVE MEMBERS 0/2
        |     (cur, max, limit, tot) = (0, 6, 0, 36)
        |     (pkts,bits) in = (4710, 5.233M), out = (7086, 74.11M)
        +-> POOL MEMBER test_uie_pool/192.168.1.1:webcache   active,up
        |   |     session enabled    priority 0    ratio 1
        |   |     (cur, max, limit, tot) = (0, 3, 0, 18)
        |   |     (pkts,bits) in = (2857, 3.278M), out = (4276, 44.76M)
        |   |     requests (total) = 237
        +-> POOL MEMBER test_uie_pool/192.168.1.2:webcache   active,up
            |     session enabled    priority 0    ratio 1
            |     (cur, max, limit, tot) = (0, 3, 0, 18)
            |     (pkts,bits) in = (1853, 1.954M), out = (2810, 29.35M)
            |     requests (total) = 137

Thanks for the help.