I was a bit surprised when I clicked on a link to Jerome's 120th letter and was led to this:

If I look to letter 1, for instance, it is the text of a letter. But what I find at 120 above looks more like an outline with comment perhaps from a modern editor (Schaff?). I am not a specialist of the NPNF or Jerome, so I don't know what's up with this. Can anyone help me with this?