Python Sockets: Image is cropped after transferring from client side to server side

I have a sever.py file which runs in a while loop:

# SNIPPET
def receive_data(client_socket):
    img_id = random.randint(1, 10000)
    try:
        file = open(f'server_image_{img_id}.jpg', "wb")
        image_chunk = client_socket.recv(2048)

        while image_chunk:
            file.write(image_chunk)
            image_chunk = client_socket.recv(2048)

        file.close()
    except:
        return False
while True:
    read_sockets, _, exception_sockets= select.select(sockets_list, [], sockets_list)

    for notified_socket in read_sockets:
        if notified_socket == server_socket:
            client_socket, client_address= server_socket.accept()

            cli_data = receive_data(client_socket)
            if cli_data is False:
                continue

and main.py, which has threads running in the background:

# SNIPPET
img = open(img_param_path, 'rb')
image_data = img.read(2048)
while image_data:
    client_inst.send(image_data)
    image_data = img.read(2048)

img.close()

and this is the output:

Note that I've tried several other images, and they seem to have the same problem too but it is barely noticeable, only this image is about 138kb. I have no idea if the problem is the size or the wrong code. Any help is appreciated!