I'm researching texts that would go well with the recent shapenote tune WEEP NOT FOR ME, and am trying to figure out to what the line "C. Mackay 10" means in this text search results
You have the columns Title and Author turned on. This may be the result of cookies on your computer. Our system tries to remember which columns you have turned on. It looks like the Title column may be the default column for text results. So the reason the result says only C. MacKay 10 is because you do not have the First Line column turned on. Not every hymn has a title. The one instance of Charles Mackay's text "Men of thought, be up, and stirring" that is connected with the tune TEMPLE is from a hymnal that does not have titles and the author's name is given as C. MacKay. There are a total of 10 instances of this text.
That makes a little more sense, though I still find it counterintuitive for the item with 10 instances to come in lower than the one with 4... but I get it, it's a second case with 1 TEMPLE instance.