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If you do normally set 'assign_devices_to_org', then the OrgID will be used to further refine the match. If you subsequently change the OrgID of a device, post discovery then you will likely have a new device created the next time the discovery runs. In this instance, you should probably just unset 'assign_devices_to_org' before running subsequent discoveries. This is because (in this instance) you have told Open-AudIT "these devices from this discovery below to Org X", but then changed the Org of the device. You have provided conflicting information. In this case - there is no no longer a device belonging to Org X, so we create a new one.
If this change does not work for you, all is not lost. We have added a configuration item (set to y by default, so it will use this new option) called discovery_use_org_id_match. If you change it to n then the OrgID assigned to the device by the discovery will not be used in the relevant match rules. We would discourage the disabling of this rule and recommend fixing your devices or altering your discoveries instead. Fix your data, not the code 