Same message ID-FID in kannel access logs

HI,

I am getting same FID in my access logs. I took a tcpdump and i founf out
that the message ID returned buy the SMSC is not the same as the FID. What
might be the cause of this. Kindly advice.
Below is sample logs
2014-06-27 17:46:59 Sent SMS  [SVC:ekbgh]   [FID:9223372036854775807]
 [from:allo] [to:233244304528] [flags:-1:0:-1:-1:31] [msg:19:rresting
random sms]
2014-06-27 17:51:43 Sent SMS  [SVC:ekbgh]   [FID:9223372036854775807]
 [from:allo] [to:233244304528] [flags:-1:0:-1:-1:31] [msg:19:rresting
random sms]
2014-06-27 18:01:14 Sent SMS  [SVC:ekbgh]   [FID:9223372036854775807]
 [from:allo] [to:233244304528] [flags:-1:0:-1:-1:11] [msg:19:rresting
random sms]
2014-06-27 18:01:52 Sent SMS  [SVC:ekbgh]   [FID:9223372036854775807]
 [from:allo] [to:233244304528] [flags:-1:0:-1:-1:1] [msg:19:rresting random
sms]

Also below is a part of my configuratiom

group = core
admin-port = 13000
smsbox-port = 13001
admin-password = bar
#status-password = foo
#admin-deny-ip = ""
#admin-allow-ip = ""
log-file = "/usr/local/SMSGW/logs/access/kannel.log"
log-level = 0
#box-deny-ip = "*.*.*.*"
#box-allow-ip = "127.0.0.1"
#unified-prefix = "+358,00358,0;+,00"
#access-log = "/data/logs/access/access.log"
access-log = "/usr/local/SMSGW/logs/access/access.lo