I was a [little] chuuni so I had no idea what they were talking about until my friend told me about it
nu bots does not take numbers from url, it takes numbers from <title>. nu bot does not read/take chapter numbers from content either. it is not much to be done if they insist on using different title vs content.
title - it uses this for chapter number link - it uses this for chapter url pubdate - chapter date category - it uses this as a cross-match agains title on nu