Slide Properties - Level 2 not available after hidden slides

I'm having difficulty in the Slide Properties window setting the level of a slide to 2 after three hidden slides (see pic).

In the pic, slide 28 is at Level 2 followed by three additional slides because they are all for that same topic.  Slide 32 should also be at level 2, but "2" is not an option when I click in the level field, it only gives the option for 1.  Is this a "bug"?

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