Live records and number of records are differents...

Hello list,

I use PostgreSQL 8.4 and Postgis 1.4.

I use FME to insert 772185 records in a table (multipolygons that represent parcels).

Everything seems fine but...
If I type select count(*), I get the right number of records : 772185 records.

But If I use pgAdmin and have a look in the stats :
- row inserted = 772185 OK fine,
- but the number of live rows is 772308...

I don't understand why the number of live rows and the number of rows is différent...
Any explaination would be very appreciated !
Thanks you

Fabrice