Can't get Favored Class Benefit to work
 

I'm using it to map out my sorcerer, and at level 6 when I select the favored class benefit, which lets me add a spell to my list of known spells, I chose a 2nd level spell. Then at level 7 I chose the favored class benefit again, and selected a 3rd level spell, but it retroactively applied it to the one I had selected at 6th level, too. I don't want two 3rd level spells, just one of each. I'm new to this program, what am I doing wrong?

Add one copy of the FCB for each spell level you want to add to. There should be a table further down the classes tab to do so.