They are not alphabetical in the actual census as shown below.
Hopefully this is some sort of fluke. I always view the actual census so the names being order really don't impact me, but the snapshot in the first image saves me a little time in "mentally estimating" the household.
I'm not certain why the household entries would be alphabetical or even need to be.
Sorting names in a household by name is not helpful--even if it is just for the families in Nebraska.