I noticed when reviewing families, that those that were carried onto the NEXT page were offered up to confirm that they were. Then you are able to index those on the next page if they need to be included. I'm thinking since this is the way, that you cannot go to the Previous page to index the family. I hope that helps.
You are correct that you are not able to go to the previous page.
I hope that this helps. Thank you for all that you do!!
brought up my parents @ the bottom of a page - then brought up the next page to look for more household members. My siblings are @ the top of that page - but, because there is a line (instead of family name) in front of their names the system doesn't list them as potential names to add to the household. So, I can't chose them. This problem needs to be fixed as I'm sure that many families are like this.
I found the same thing with my own family.
Here is an article that describes what to do. https://www.familysearch.org/en/help/helpcenter/article/how-do-i-handle-an-incomplete-family-continued-from-the-previous-image
Basically it says Skip the Household, select other as the issue, then describe the problem. This will report the problem to be handled in a different way.