When one makes a "comment" to an entry, there is a "Title" field (default-filled with "Comment to [original entry's title]"), but one could change the Title. However, whatever is in the title field for the comment does not show up with the Comment entry. It would be nice to tag your comment/sub-entry with Title.
I've noticed that as well. I would suggest filing a bug against the "alog" product in the CDS bugzilla:
https://bugzilla.ligo-wa.caltech.edu/bugzilla3/enter_bug.cgi?product=alog
You should also make the "Section" of this log entry be "Logbook Admin".