No. If you have two recipes, one recipe for 600g flour and the 2nd with 400g, the application registered this as 2 x Flour - not  1 kg (the amount of flour in the recipes).
This is by design, Grosh does not transfer any amount when adding ingredients from a recipe to a shopping list.
This is because many people just want to buy the ingredients, not a package exactly matching the quantity mentioned in the recipe.