I am helping a friend with his manuscript and he asked me for help removing some instances where single digits are placed in his manuscript. They seem to related to text in a different location in the manuscript (possibly cross references). It looks like this

text here
2
more text here

The "2 is uneditable from "Print Layout" view and when I switch to draft view, the "2" is replaced by a blue line and text that would appear pages later in "Print Layout" view.

I have two questions: what is happening here and how to remove the numbers? Any responses appreciated.