Running latest version of OF for iOS on iPhone and iPad.
I am able manually to change the order of actions by dragging and dropping in some views (Tags, Projects, Inbox), but not in others (Forecast, Flags, and custom perspectives).
I know on the Mac I can un-select “Keep Sorted” to give myself the ability to manually change items’ orders, but cannot figure out how to do this in iOS.
This is a new feature in the TestFlight builds of OmniFocus 4; it looks like the reason you were seeing different behavior on the two platforms is because you were using the TestFlight builds on Mac but not on iOS.