few accounting records with same radacctid

[Hocine M]

hello,

In ma accounting table there are many records with the same radacctid 
for one username.

In this case

|     23547 | SESS-50639-54b752-237134-642 | test at univ-rouen.fr | 
univ-rouen.fr| 2013-02-07 12:38:54 | NULL                | 192.168.58.5 
| 00-26-3E-70-99-C0:eduroam | 10.54.1.19 | CC-08-E0-BB-05-7E |
|     23554 | SESS-50639-54b752-237134-642 | test at univ-rouen.fr | 
univ-rouen.fr| 2013-02-07 12:38:54 | 2013-02-07 12:39:41 | 192.168.58.4 
| 00-0B-0E-A9-5B-C0:eduroam | 10.54.1.19 | CC-08-E0-BB-05-7E |

Is it a normal records or is the simultaneous-use not working in my case?

Thank



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