Could this be a bug in the system?

The nesting loop exercise is already done even though instruction says

Modify function multiplyAll so that it multiplies the product variable by each number in the sub-arrays of arr

Just to mention!!

function multiplyAll(arr) {
  var product = 1;
  // Only change code below this line
  for (var i = 0; i < arr.length; i++) {
    for (var j = 0; j < arr[i].length; j++) {
      product *= arr[i][j];
  // Only change code above this line
  return product;

// Modify values below to test your code
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