issue with table of contents - all slides not showing up

my table of contents on the left is leaving out slides 9-11, though if you go to slide 8, and click next, the slides will appear. they just do not appear in the table of contents and i am not sure why. i created a new slide each time or duplicated another slide. they are numbered correctly and in my chapter view within storyline, they appear and are numbered 1.9, 1.10, 1.11, and are numbered accordingly by me. i'm not sure why this is happening but would like to have them appear in the table of contents as they are necessary and need to be easily accessed! i provided a link to my course below:

http://trwref.articulate-online.com/p/2846671574/DocumentViewRouter.ashx?Cust=28466&DocumentID=73f6265e-db50-4d81-9a85-847605f4bba2&Popped=True&InitialPage=story.html

thanks!

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