If you want the event to be moved automatically you need to use "Update" value for the *Handling properties:
config: any = {
eventMoveHandling: "Update",
eventResizeHandling: "Update"
}
If you handle onEventResize (onEventMove) you can cancel the action by calling args.preventDefault().
The onEventResized (onEventMoved) handler is called when the update is complete (the event has already been moved).
Let me know if the problem persists.