Bug in the Carbonation Tool?

Volumes of CO2: 2,5 vol
Temperature: 19 C
Beer volume: 16 L

BeerSmith results:
Corn sugar weight: 103,57 g
Table sugar weight: 94,24 g

Brewersfriend results:
Corn sugar weight: 113,4 g
Table sugar weight: 103,2 g

Applying the manual formula: (2,5 - 0,89) * 4 * 16 = 103,04 g

(see attachments)

So, is BeerSmith's calculated weight of table sugar wrong?

Thanks.