Objects occasionally not being deleted

I sometimes experience a problem with objects not being deleted from the MV, and remaining in FIM after a successful delete operation.

MV deletion rule is configured to delete the object from the MV when the connector from FIM is disconnected:

Deprovisioning on non-FIM MAs is configured with "stage a delete on the object for the next export run":

Here is an example of the problem.
These are the requests:

As you can see, there is a successful delete request for the object at some point, but the object is still present in the metaverse:

This does not happen all the time, but only occasionally.

Has someone experienced this problem?

Is there anything I should check?

Thanks,
Paolo

Paolo Tedesco - http://cern.ch/idm