Keypad connection problem

[iranarr]

Hey all,
I am trying to use a 4x5 Matrix Keypad

I want to use the pins 4, 5, 18, 19, 21, 22, 23, 25 ,26
but I get weird result

A button repeatedly sends the value
Exactly the first value is sent to the matrix. ( value "1")

Unfortunately I tried other pins but there is a problem
Also, I tested the other board and the keypad thoroughly, it was not a problem


matrix :
{'1', '2', '3', '4', '&'},
{'5', '6', '7', '8', '*'},
{'9', '0', 'a', 'b', '#'},
{'c', 'd', 'e', 'f', '-'},
{'g', 'h', 'i', 'j', '+'}