costs for IFS if several meal options are offered

I just tried to find out how the IFS pricing works, and arrived at some strange effect:

When I chose only one breakfast option (free of charge), the maximum income (or more appropriate cost) per passenger is the cost of the meal, e.g. $-24 for a 4star breakfast; additionally the base costs are $16. If I offer two options, the per passenger cost increases: for two 4 star options the maximum income per passenger becomes $-71, the base cost increases to $44. If I add a third option (also 4 star), the per passenger income and base cost remain at $-71 and $44 dollar respectively.

Although a sight increase might be possible, if the airline takes a bit more meals than passengers to be able to fulfil unexpected changes in the demand for one option or the other, this should not increase the cost so dramatically - even in the unrealistic case that the airline is so nice to have of both options as many meals as passengers on board, the costs should just double. Or in other words: I guess there is a bug.

By the way: I did those tests with the IFS without choosing any other options but the breakfast.

Edit: I also tested the same, but now setting the price for the breakfast to $40. If I only offer one option, I can make a maximum profit of $16 per pax (which is reasonable, as the 4star breakfast costs 24$). For both two or three options, the maximum income increases to $49 per pax.