she didnt get mine, only gave her one shot tho... (11)
She got it - you didn't do the math right. 11-1=10-1=9. Look at the table again and all the multiples of 9 have the same item. When you reset it, it mixes up the items, so that if you don't pay close attention, you don't notice.
And Steve is right - with every two digit number, when you subtract the sum of it's digits, you get a multiple of 9.
Pulling numbers out of my head:
My age (44) 4+4= 8; 44-8=36; 36=4x9
My son's age (11) 1+1=2; 11-2=9
My dad's age (70) 70-7= 63; 63=9x7