why am i getting more decimal places from subtraction?

Question

was doing an algorithm question, and my code produced unexpected output. heres the code

const price = 3.26;
const cash = 100;
const cid = [
  ["PENNY", 1.01],
  ["NICKEL", 2.05],
  ["DIME", 3.1],
  ["QUARTER", 4.25],
  ["ONE", 90],
  ["FIVE", 55],
  ["TEN", 20],
  ["TWENTY", 60],
  ["ONE HUNDRED", 100]
];

function checkCashRegister(price, cash, cid) {
  let change = cash - price;
  let totalInReg = 0;

  for (let i = 0; i < cid.length; i++) {
    totalInReg += cid[i][1];
  }

  if (totalInReg < change) {
    const output = {
      status: "INSUFFICIENT_FUNDS",
      change: []
    };
    console.log(output);
  }

  const coins = {
    'PENNY': 0.01,
    'NICKEL': 0.05,
    'DIME': 0.1,
    'QUARTER': 0.25,
    'ONE': 1,
    'FIVE': 5,
    'TEN': 10,
    'TWENTY': 20,
    'ONE HUNDRED': 100
  }

  const outputArr = [];

  for (let i = cid.length - 1; i >= 0; i--) {
    const coinType = cid[i][0];
    let coinReg = cid[i][1];
    const coinValue = coins[coinType];
    const infoArr = [];

    if (coins[coinType] > change) continue;

    let currCoinCt = 0;

    do {
      coinReg -= coinValue;
      change -= coinValue;
      /* change = parseFloat(change.toPrecision(4)); */
      console.log(change)
      currCoinCt++;
    } while (coinReg > 0 && change >= coinValue)

    infoArr.push(coinType);
    infoArr.push(currCoinCt * coinValue);
    outputArr.push(infoArr);

  }


}

was expecting it to subtract the coin values, which only had 2 decimal places max. but the output i get in the console is:

76.74
56.739999999999995
36.739999999999995
26.739999999999995
16.739999999999995
11.739999999999995
6.739999999999995
1.7399999999999949
0.7399999999999949
0.4899999999999949
0.23999999999999488
0.13999999999999488
0.03999999999999487
0.02999999999999487
0.01999999999999487
0.009999999999994869

with use of toPrecision and parseFloat, i was able to remedy my problem. but why is this happening? is this a javascript thing? i am using an online editor on 'jsfiddle.net'. thanks in advance