Check the saddles have not become mixed during movement of the unit or over time.
The stainless steel saddles should be on the bottom and copper on the top rather than mixed. If mixed this could impact the outcome and lower the ABV. Remove the column cap and invert the unit to shake all the saddles out and then repack them. Also check that you have the Reflux Distillation Tip installed. This is the tip with the letter R etched on the side.