Ropsten Etherscan muestra 0 titulares para mi token

Creé un token compatible con ERC20 en Ropsten testnet. Configuré en el constructor que todo el suministro de tokens se agrega a la dirección de mi billetera. Cuando abro los metamaks veo que tengo las fichas. Aquí está la captura de pantalla [

Sin embargo, cuando reviso la página del token en ropsten etherscan aquí , veo que la cantidad del titular del token está establecida en 0.

Vi este hilo que muestra un problema algo similar, excepto por el OP de ese hilo, el etherscan detectó correctamente la cantidad de poseedores de fichas, es solo que la cantidad es incorrectamente 0. Las respuestas fueron que este es un error temporal con ropsten etherscan pero desde casi 2 han pasado años no estoy seguro si el problema que encuentro tiene algo que ver con eso.

Aquí está mi código de contrato:

    /**
 *Submitted for verification at Etherscan.io on 2020-05-18
*/

pragma solidity >=0.4.0 <0.7.0;

// ----------------------------------------------------------------------------
// ERC Token Standard #20 Interface
// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
// ----------------------------------------------------------------------------
interface ERC20Interface {
    function totalSupply() external view returns (uint256);
    function balanceOf(address tokenOwner) external view returns (uint balance);
    function allowance(address tokenOwner, address spender) external view returns (uint remaining);
    function transfer(address to, uint tokens) external returns (bool success);
    function approve(address spender, uint tokens) external returns (bool success);
    function transferFrom(address from, address to, uint tokens) external returns (bool success);

    event Transfer(address indexed from, address indexed to, uint tokens);
    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}

    contract AtariToken is ERC20Interface {

    string public constant name = "AtariToken";
    string public constant symbol = "ATAR";
    uint8 public constant decimals = 0;

    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
    event Transfer(address indexed from, address indexed to, uint tokens);
    event RegistrationSuccessful(uint256 nonce);
    event RegistrationFailed(uint256 nonce);

    mapping(address => uint256) balances;

    mapping(address => mapping (address => uint256)) allowed;

    uint256 totalSupply_ = 7777100000;

    mapping (string => address) addressTable;

    using SafeMath for uint256;

    constructor() public{
        balances[msg.sender] = totalSupply_;
    }

    function totalSupply() public override view returns (uint256) {
        return totalSupply_;
    }

    function balanceOf(address tokenOwner) public override view returns (uint) {
        return balances[tokenOwner];
    }

    function balanceOf(string memory tokenOwner) public view returns (uint) {
        address userAddress;
        userAddress = addressTable[tokenOwner];
        return balances[userAddress];
    }

    function transfer(address receiver, uint numTokens) public override returns (bool) {
        require(numTokens <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender].sub(numTokens);
        balances[receiver] = balances[receiver].add(numTokens);
        emit Transfer(msg.sender, receiver, numTokens);
        return true;
    }

    function transfer(string memory receiver, uint numTokens) public returns (bool) {
        address receiverAddress;
        receiverAddress = addressTable[receiver];
        require(numTokens <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender].sub(numTokens);
        balances[receiverAddress] = balances[receiverAddress].add(numTokens);
        emit Transfer(msg.sender, receiverAddress, numTokens);
        return true;
    }

    function approve(address delegate, uint numTokens) public override returns (bool) {
        allowed[msg.sender][delegate] = numTokens;
        emit Approval(msg.sender, delegate, numTokens);
        return true;
    }

    function approve(string memory delegate, uint numTokens) public returns (bool) {
        address delegateAddress;
        delegateAddress = addressTable[delegate];
        allowed[msg.sender][delegateAddress] = numTokens;
        emit Approval(msg.sender, delegateAddress, numTokens);
        return true;
    }

    function allowance(address owner, address delegate) public override view returns (uint) {
        return allowed[owner][delegate];
    }

    function allowance(string memory owner, string memory delegate) public view returns (uint) {
        address ownerAddress;
        ownerAddress = addressTable[owner];
        address delegateAddress;
        delegateAddress = addressTable[delegate];
        return allowed[ownerAddress][delegateAddress];
    }

     function transferFrom(address owner, address buyer, uint numTokens) public override returns (bool) {
        require(numTokens <= balances[owner]);    
        require(numTokens <= allowed[owner][msg.sender]);

        balances[owner] = balances[owner].sub(numTokens);
        allowed[owner][msg.sender] = allowed[owner][msg.sender].sub(numTokens);
        balances[buyer] = balances[buyer].add(numTokens);
        emit Transfer(owner, buyer, numTokens);
        return true;
    }

    function transferFrom(string memory owner, string memory buyer, uint numTokens) public returns (bool) {
        address ownerAddress;
        ownerAddress = addressTable[owner];
        address buyerAddress;
        buyerAddress = addressTable[buyer];

        require(numTokens <= balances[ownerAddress]);    
        require(numTokens <= allowed[ownerAddress][msg.sender]);

        balances[ownerAddress] = balances[ownerAddress].sub(numTokens);
        allowed[ownerAddress][msg.sender] = allowed[ownerAddress][msg.sender].sub(numTokens);
        balances[buyerAddress] = balances[buyerAddress].add(numTokens);
        emit Transfer(ownerAddress, buyerAddress, numTokens);
        return true;
    }

    function registerUser(string memory user, uint256 nonce) public returns (bool) {
        if (addressTable[user] == address(0)) {
            addressTable[user] = msg.sender;
            emit RegistrationSuccessful(nonce);
            return true;
        } else {
            emit RegistrationFailed(nonce);
            return false;
        }
    }
}

library SafeMath { 
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
      assert(b <= a);
      return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
      uint256 c = a + b;
      assert(c >= a);
      return c;
    }
}