Why would you compare the income of mobile/IP to the profits of Nintendo as a whole? You're supposed to look at the total income, which is the net sales category.
It makes no sense to compare income to net sales. Net sales is just the money Nintendo made from selling stuff. It does not take into considered cost of goods, expenses, etc.
Yes, you have just described exactly why your comparison makes no sense. The "Profits" section takes into account all of the expenses, while the specific "Mobile" category is purely income, and should thus only be compared to other pure income figures.
I invite you to look at page 7 of their consolidated financial highlights, in which they list the total income of mobile/IP as 9.062 billion yen, versus the 144.615 billion yen of income from their dedicated gaming devices.