The confusion begins with my erroneous inclusion of the hitch weight an additional time in what should have been the real GVWR, as GVWR would be only the dry weight plus net carry capacity (2996 + 854) which is shown on the GS website as a target sum of 3850. The notes on your sticker state the GVWR INCLUDES the tongue weight...
Is this trailer new to you? What year model is it?? The weight you observed on the CAT scale is more than should be expected for this little trailer. In fact the observed tongue weight is 31% higher than the listed tongue weight , and the scale value for the 'dry' weight of 3420 is about 15% higher than expected -- which again makes the accuracy for the 300,000 pound rated CAT scale at small readings a potential factor. While this a possible source at least some of the discrepancy, more likely the added pounds are real. Were all tanks completely dry, for instance (the fresh water tank alone would be more than 75% of the allowed net carry weight...)
But it is also known that RVs are notoriously heavier in actual use than their ratings, so check any added options/accessories your trailer has that were not factored into the "as manufactured, factory weight"