Old AD entries won't be deleted by the sync

Old AD entries won't be deleted by the sync

Hi people, 

when i manually add a computer from
Agent -> Computers -> Add Computer
i keep on seeing very old AD entries, of computers deleted by lot of time (and not in AD bin). Seems that the daily sync can add objects but do not remove objects no longer present in AD.

this is our conf of the AD Sync:

is this a normal behaviour or am i making a mistake somewhere?

thanks for your help
Thomas

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