The bigger picture is the Lord is at work in this helping families get closer because of mistakes what one does not have the other has to help solve are to make aware that there are mysteries in the family tree to be resolved yet!
But what if those records are inaccurate as you suggest?
What if you do the Temple ordinances and seal someone to the wrong family. What if you baptize for the dead under the wrong name, and that person is stuck in Spirit Prison waiting for someone who can type decently enough to get it correct?
What then?
(What did she say?)