very often there are 3 males , 2 females, sometimes just one person- it just means that is all the names on that page only -couples aren't necessarily next to each other or even on the same page.
That is why when you request a marriage look up you will often get "on same page" -meaning the 2 names you are enquiring about are on that page -you can never be 100% who married who unless you have the certificate.
So you are not doing anything wrong -try looking for Thomas Nightingale in the same qtr -he may be on his own -or 2 men and 1 female -or any combination.
Suz