Slides don't display in the "table of contents"

I've just started using Storyline Articulate, so I'm a raw newbie. I created my content slides, as well as quiz slides. When I view the entire project, some of my slides aren't listed on the left side "Table of Contents". As it uploads, it says there are 53 slides, but Table of Contents is 'hit and miss' re those represented in the project.

Thanks for any help you can give me

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