Hi Ian,
There is indeed something odd with this snippet, and ergo probably with the parent file as well.
I was able to get the E# to display as F natural, but the chord names won't select to be deleted.
I tried entering the notes for the treble clef in by hand, and adding the chord names. My version looks fine, so I suspect that something that happened at some point in the parent file is causing the issue.
SpacingIssue.jpg
Can you give me a bit more history about the file, and perhaps the full parent file?
ttfn,
Sherry