When I group the above list by the Status field the list items are not visible. If I group by a different field, the groups work correctly
2 Answers
The dropdown choice had a tab and that's why it didn't work.
Changing the statuses from "1. Name" to "1.Name" meant the view worked
Can you expand the result (Status column) and show how the list items are not visible? In the above screen shot each result row has the count and when you expand it, it will show the actual list items.