I have had examples where I have made mistakes entering spouses. If I make a wrong entry its easy to remove the person of course but the number spouse numbers can be wrong.
To make this clearer I have a "A" male married to a "B" female. I then add a "C" female and therefore it will show a "2" against the male person. When I find I don't want the "C" female I remove by deleting the person "C". However the "2" remains. I must be missing something here.