[IFS] Headphones weired price

Hi Airliners,

when I started to create an IFS offers, I always was able to produce only negative Max. profits. So I started trying to find how it works and I find a very weird thing - costs of meal/accesories are what are declared (e.g. snack = $6) and so if you choose only one thing and give it for free, max. profits per pax are negative the price (e.g. for the snack = $-6). 

BUT if you offers only headphones, they should cost you only $2.35 and if free, pax should return them so the max. profits per pax should not be smaller then $-3. However, IFS shows max profit per pax $-34. Why?

Do I understand the behavior of IFS in the wrong way or is a bug?

Thanks!

Yours,

kubka.slamak
  
P.S.: I attached the printscreen of the problem.