It lists class 4-planets as being able to support 5b while they can only support 2.5b (according to Wiki). My guess after only starting a game and colonizing Iconia V is that it always lists the food production now which you can see anyway if you look a couple of mm to the right.

I propose that you change it to one of the two following options:
1) Always show the planet quality-limit.

or

2) Show the food production if: pq-limit > food prod.
Show the pq-limit if: pq-limit < food prod.