Thomas Preston, IV - Merge issues is mother Dobroah Norton or ELizabeth Harrison

My filies has his mother as Deborah Preston (Norton) not Elizabeth Harrison -

Lady Deborah Preston (Norton)
Gender: Female
Birth: circa 1610
Norwich,Norfolk,England
Death: July 29, 1674 (59-68)
Calvert, Maryland, United States
Immediate Family:
Daughter of Sarah Corbet
Wife of Thomas Preston, III and Thomas Preston

she is also shown with 2 husbands by the name of Thomoas Preston which suggest the change in mother is a merge issue.

@Thomas Preston, III

@Elizabeth Harrison

@https://www.geni.com/people/Lady-Deborah-Norton/6000000006598817