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Parent/Child frame relationship and Source/Target frame relationship are different concepts and would not be expected to be ordered the same way all the time.
The Parent/Child relationship is concerned with how a frame is defined. The child frame is defined in terms of the parent frame, so that any changes to the parent or the chain of its parents will effect the location of the child frame (as well as all of its children).
The Source/Target relationship is concerned with looking up the transformation between any two connected frames. In this case the lookup is converting some geometry that is originally defined in the source frame so that it becomes defined in the target frame. These lookups can be between parent/child or child/parent or two different branches, anything as long as the TF frames are connected somehow.
Hope this helps.
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