pls help, something wrong

when i want to cite in my work it appear like this  (S Bhagat & Black, 2002)

i don’t know why the last name which is “S” keep appearing infront of the citation above where it supposed to be like this (Bhagat & Black, 2002)

pls any advice will be appreciated

if u have no idea, pls advice me of how to edit it manually as it returns back automatically to the first form.

thank u so much in advance