XF 1.3 Can't create a sibling node


First time user of xenforo here and I'm unable to create a sibling node.

This is the method that I've tried: Applications>Node tree>forum>create new..sibling

However, whenever I click create sibling, it always direct me to the 'create child node' instead of 'create sibling node' of the forum page.

Any idea what I'm doing wrong?

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