Heighten Spell, isn't it supposed to upgrade a spell to another level?

Hi guys was trying out the Heighten Spell feature on Instant Enemy and the spell has stayed at the same level, obviously I wanted to be able to cast it at two levels for less time camping. Is this supposed to be like this?

When you add Heighten, a little arrow appears at the “Result spell level” number at the bottom. It starts at +0 (no change), and then you just have to click the arrow to make it the spell level that you want.

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thank you, I missed that, much appreciated