Why are my slide levels

Hi-

I have my slide levels set as follows:

Slide 1 - Level 1
Slide 2 - Level 1 (Hidden)
Slide 3 - Level 2
Slide 4 - Level 2 (Hidden)
Slide 5 - Level 1

Which I expect to display as follows in my ToC:

Slide 1
- Slide 3
Slide 5

However, Slide 3 is not appearing in my ToC. Instead, I just see:

Slide 1
Slide 5

I have been using this level format for many presentations and it has worked. Now in this particular one it is not working. Is this a glitch or am I missing something obvious (which is quite possible)

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