BE 2012 and DAG Exchange 2010 : Exchange thinks incremental are full

Hi,

When I use the powershell command to check when did my last incremental backups occured, exchange seems to think that my incremental backups are full backups :

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Clik here to view.

These are really incremental backups (I've checked in jobs history).

Is there an option to turn in BE in order to make Exchange seing the 'truth' ?  :)

Thanks in advance,

Anthony.