Commercial Fixed Wing
Dispatch Dispatcher
Other / Unknown; Troubleshooting
Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Hazardous Material Violation
General None Reported / Taken
Human Factors
About an hour after flight XXXX took off out from ZZZ; Load Planning called alerting me that they had loaded extra Hazmat. According to their numbers; the aircraft was only allowed a total of 6.0 units; but 7.7 were added. I notified the crew; and the CA called me upon landing. He stated that his paperwork only showed one dangerous goods item as opposed to the three on my side.
One hour into my flight; Dispatch sent ACARS message to call due to incorrect Hazmat load.  Once on the ground called Dispatcher.  He informed me an additional 7 lbs of Hazmat was loaded onto my aircraft.  My final dangerous goods manifest had 1.1lbs.  He said there was an additional add without our knowledge.
Air Carrier Dispatcher and a Captain reported the flight departed with hazmat documentation errors and inaccurate data.