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Good Afternoon Russ,
How are the domains under 'Types' at the rest end point sorted? I assumed it was related to the Coded Domain value, but I went through and manually re-coded our domain descriptions to alphabetically line up with an ascending coded value. At the rest end point under Types I am still seeing the same sorting as before.
As Russ is suggesting, you need to look at the types section in the feature's JSON file. Getting domains to sort (and stay sorted) in collector has been so frustrating, that when I publish a feature layer I add a step to resort items in the types section. I use the REST API to do this, and I briefly describe my process here: Feature type sort order in REST API using Python.