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On the "Class" tab in the editor, select your Stormcaster class and scroll down to the "Miscellaneous Details" section in the bottom center. Click on the Edit button for the "Extra Magic/Power Levels" line and, starting in row 1 (not row 0), put a 1. In row 2, put a 2, a 3 in row 3, and so on until level 9 gets a 9. Save and test.
As you might have seen in the tooltip that pops up on the ? dot, each of those rows is how many cumulative spellcaster levels the class adds to another class at each prestige class level. If you don't increase the number in each row where the PrC chart says you get another spellcaster level, it doesn't grant it.
Also, it's a bit un-intuitive but Row 0 is the first class level, not Row 1. Because Stormcaster doesn't grant a caster level at PrC level 1, you don't put anything in the Row 0 line.
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