Hi Katie
You need two separate grading scales, where weighted courses get one, and regular courses get the other (i.e. in your "Final Grade" grading task, set on the course tab-set).
For the grading scale used on unweighted courses, the GPA Value and Unweighted GPA Value are the same.
For the grading scale used on weighted courses, the GPA Value shows the weighted value, and Unweighted GPA Value does not.
For example, if an AP math course has a 110% weighting, and you use a 4.0 GPA scale, then the GPA Value for an "A" (on the score group definition) is 4.4, and the unweighted GPA column is 4.0... and a B = 3.3 vs 3.0 etc...