IP allocation problem

[Tevfik Ceydeliler]

Hi
Altough I use sqlippool adn lease time 6 hours, why one user get more 
than one IP?
mysql> select * from radippool where username like 'kalaypazarlama3' ;
+------+-----------------------+-----------------+--------------+-----------------+------------------+---------------------+-----------------+----------+
| id   | pool_name             | framedipaddress | nasipaddress | 
calledstationid | callingstationid | expiry_time         | 
username        | pool_key |
+------+-----------------------+-----------------+--------------+-----------------+------------------+---------------------+-----------------+----------+
| 2227 | IP_TcellOtonomYBC-YBD | 172.30.72.187   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 16:10:36 | 
kalaypazarlama3 | 115729   |
| 2228 | IP_TcellOtonomYBC-YBD | 172.30.72.188   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 14:30:31 | 
kalaypazarlama3 | 75047    |
| 2229 | IP_TcellOtonomYBC-YBD | 172.30.72.189   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 14:07:08 | 
kalaypazarlama3 | 81165    |
| 2230 | IP_TcellOtonomYBC-YBD | 172.30.72.190   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 14:00:51 | 
kalaypazarlama3 | 51588    |
| 2231 | IP_TcellOtonomYBC-YBD | 172.30.72.191   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 13:51:31 | 
kalaypazarlama3 | 97344    |
| 2232 | IP_TcellOtonomYBC-YBD | 172.30.72.192   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 14:06:28 | 
kalaypazarlama3 | 71919    |
| 2233 | IP_TcellOtonomYBC-YBD | 172.30.72.193   | 172.30.80.1 
|                 | 905333685343     | 2015-03-03 16:24:37 | 
kalaypazarlama3 | 96540    |
+------+-----------------------+-----------------+--------------+-----------------+------------------+---------------------+-----------------+----------+

Any idea? or suggestion where I look?
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