Ctypes 2d array of strings in python stores different strings at same memory address

Question

the python code i have is pretty simple:

from ctypes import *
from random import randint

class uni(Union):
    _fields_ = [('p', c_char_p),
                ('a', c_longlong)]

#initializing the array of strings
x = ((c_char_p * 3) * 10) ()
for i in range(10):
    for j in range(3):
        x[i][j] = str(randint(100, 999)).encode('utf-8')

#it prints what i expect it to print
for i in range(10):
    for j in range(3):
        print(x[i][j], end = ' ')
    print()
    
print("addresses")
for i in range(10):
    for j in range(3):
        t = uni()
        # getting an integer that points to the string to print string's address
        t.p = x[i][j] 
        print(hex(t.a), end = ' - ')
        print(string_at(t.a), end = ' | ')
    print()

This outputs the following:

b'475' b'912' b'805' 
b'107' b'986' b'191' 
b'389' b'525' b'921' 
b'441' b'869' b'452' 
b'505' b'788' b'571' 
b'111' b'974' b'758' 
b'447' b'975' b'671' 
b'322' b'633' b'332' 
b'924' b'633' b'174' 
b'677' b'611' b'431' 
addresses
0x7fdfbbbcad80 - b'475' | 0x7fdfbbbcad80 - b'912' | 0x7fdfbbbcad80 - b'805' | 
0x7fdfbbbcad80 - b'107' | 0x7fdfbbbcad80 - b'986' | 0x7fdfbbbcad80 - b'191' | 
0x7fdfbbbcad80 - b'389' | 0x7fdfbbbcad80 - b'525' | 0x7fdfbbbcad80 - b'921' | 
0x7fdfbbbcad80 - b'441' | 0x7fdfbbbcad80 - b'869' | 0x7fdfbbbcad80 - b'452' | 
0x7fdfbbbcad80 - b'505' | 0x7fdfbbbcad80 - b'788' | 0x7fdfbbbcad80 - b'571' | 
0x7fdfbbbcad80 - b'111' | 0x7fdfbbbcad80 - b'974' | 0x7fdfbbbcad80 - b'758' | 
0x7fdfbbbcad80 - b'447' | 0x7fdfbbbcad80 - b'975' | 0x7fdfbbbcad80 - b'671' | 
0x7fdfbbbcad80 - b'322' | 0x7fdfbbbcad80 - b'633' | 0x7fdfbbbcad80 - b'332' | 
0x7fdfbbbcad80 - b'924' | 0x7fdfbbbcad80 - b'633' | 0x7fdfbbbcad80 - b'174' | 
0x7fdfbbbcad80 - b'677' | 0x7fdfbbbcad80 - b'611' | 0x7fdfbbbcad80 - b'431' | 

How? how does it store different strings at the same address??

Note: I found this when I was debugging a program that passes a 2d array of strings to C++ shared object. The C++ function is defined as folows:

extern "C" 
void print2d(char*** arr, int len, int inner_len)
{
  std::cout << arr << '\n';   //ok
  std::cout.flush(); 
  std::cout << *arr << '\n';  //ok
  std::cout.flush();
  std::cout << **arr << '\n'; //this segfaults
}

if anyone has any suggestions to fix this, i would be glad to hear them out