Token 我能'；在BSC测试网上看不到总供应量

为什么不显示总供应量，而余额为0

合同如下：

这是我的代码：

pragma solidity ^0.6.12;
//SPDX-License-Identifier: Unlicensed

contract TotalsupplyDisplay {

string public name;
string public symbol;
uint public decimals;
uint public _totalSupply;

mapping (address => uint) public balances;

constructor() public {
    
   _totalSupply = 100000000000 * (10 ** uint(decimals));
   name = "TokenName";
   symbol = "TKN";
   decimals = 7;
   
}

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

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


}