On Mary's profile, it states that Mary was firstly married to Phineas Preston in 1692. However, her profile has her linked to an Archibald Preston. Archibald's father is named Phineas Preston, so perhaps there was simply a bad merge? But it even that seems unlikely because Archibald's Phineas Preston's died in 1671 (according to his geni profile), which is 20 years before was Mary married her Phineas Preston. Also, Mary Stewart has several Preston children attached to her profile who are not mentioned in her about page, which has citations.
Does anyone have any information on Mary Stewart and Phineas Preston? I suspect that some bad merges may have confused her profile.