hi, do u mind to share how the cash back been calculated..?

my spending on ewallet =RM 1,500 (shall get RM 15 cash back) and dining RM 523.20 (shall get RM 1.04). (total cash back = RM 16.04)

however, i get RM 3.98 as cash back earned and RM 9.12 as cash back everyday in the next statement. (actual amount that i get = RM 13.10)