It's definitely a repeat, in the middle of the page, not carried over to the next page. A couple of other families were repeated as well, but not all of them.
On both pages 8 and 9 the house number and family number are the same. But on one page they transcribed the surname Jolley as "Jossey" and misspelled another first name. But it's a six-member family and all the names align, so it's definitely the same family.
Since there are no other markings in the margins, I guess we just have to chalk it up to human error. Whenever you have humans doing these things, errors are bound to happen.