Managers of Harriet,
I think the children, while being born to Harriet(t), are being misattributed to George Charles Fry --- unless he always went by Charles.
Possibly more likely is that they were born to Charles Stock Fry.
I searched broadly in SA records to find any Fry - Leedham children or any Surname Fry, first name Harriett marriages and can only come up with Charles Fry.
I have attached two screen grabs of what I found, with the broad search terms highlighted. See them under the Media tab on Harriets profile.
Please also see Charles Stock Fry's profile for someone elses biographical information held by Genealogy SA.