IDs (and hence url fragments) can't start with a numeral (might just be an ADE thing, I'm not entirely sure, but it's best to just not do it anymore once you know).
<a href="../Text/06-One-Notes.xhtml
#1-1">
Means that somewhere there is an ID that looks like: <p id="1-1"> or <a id="1-1"> or <h2 id="1-1"> or something to that effect.
Change the ID so that it starts with a letter (or I believe an underscore will work too).