Nodes (6), (14) and (27) do not have devices attached. Sometimes these "ghost" nodes will block or interfere with pairing new devices. Especially lock ghosts, which is what (6) and (27) are.
Here is the unofficial guide on how to get rid of those:
How To Remove Ghosts using hub tools or a UZB Stick
Make sure you also read the z-wave section of this post:
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