Stratton Hicky says about this profile: John Robertson, Jr.
There is an obvious inconsistency with the profile for John Robertson, Jr. Most notably, with him being born in 1720 and passing in 1841 at the age of 21, yet reflecting he had four children with several being born many years after his passing. I suspect he only had a son, John Robertson, III, who then had the other children you have listed for John Robertson, Jr. At least then the dates of birth and death for Sarah (born 1764 and my G-G-G Grandmother), and Rebecca (born 1755) would make sense.
In this merge https://www.geni.com/merge/view?revision_id=77577785680 his dates are more likely:
It would solve the problem to use the dates from the merged in profile crated by Charles Charles Arthur Byrd, Jr.