Not all duplicants are getting their "downtime"

Not all duplicants are getting their "downtime" - Woman in White Shirt and Black Pants Sitting on Chair Reading Book

I have the default colony schedule for all duplicants which gives two time slots to "downtime", but some of the duplicants are not getting the "downtime" +1 buff. In fact, only 2 of my 8 duplicants are getting the buff.

Why is this, and how can I get the buff for all 8 duplicants?






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Not all duplicants are getting their "downtime" - Small Girl Getting Glasses at Optician 
Not all duplicants are getting their "downtime" - A Man Wearing a Weighted Vest
Not all duplicants are getting their "downtime" - Side View of a Man in a Weighted Vest Holding a Dumbbell





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Images: cottonbro, Gustavo Fring, Mikhail Nilov, Mikhail Nilov