Problem Changing variable in a list of object list in python

Question

I have an issue that I can't change the variables in the list in an object when I try, the program is setting all the variables every object in the list
Is there any way to figure out?

(The number doesn't change but list is changing every pass in loop)

import openpyxl

class Student:
    number = 3333
    variables = [9, 9, 9, 9, 9, 9, 9, 9, 9, 9]

students = []
for i in range(2):
    students.append(Student())

book = openpyxl.load_workbook('list.xlsx')
sheet = book.active
for i in range(2):
    students[i].number = sheet.cell(i+1, 1).value
    for j in range(10):
        students[i].variables[j] = sheet.cell(i+1, j+2).value

the excel format

debugging while 1st pass

debugging while 2nd pass