При смене max и min у input type="range" перестают суммироваться суммы,помогите пожалуйста

var basePrice = 28900;
var basePrice_2 = 0;
var basePrice_3 = 0;
var bedroomCostFactor = [0, 10, 35, 70, 95, 120];
var bathroomCostFactor = [0, 25, 50, 75, 100, 125];

document.querySelector('#bed_service').addEventListener('change', function(evt) {
  var value = evt.target.value;
  // value will be a string. Coercing to a number using +value
  var bedCost = parseInt(getBedroomCost(+value), 10).toFixed(2);
  
  document.querySelector('#bed_display').innerHTML = value;
  document.querySelector('#bed_cost').innerHTML = bedCost;
  
  getTotalCost();
});


document.querySelector('#bath_service').addEventListener('change', function(evt) {
  var value = evt.target.value;
  // value will be a string. Coercing to a number using +value
  var bathCost = parseInt(getBathroomCost(+value), 10).toFixed(2);
  
  document.querySelector('#bath_display').innerHTML = value;
  document.querySelector('#bath_cost').innerHTML = bathCost;
  
  getTotalCost();
})

function getTotalCost() {
  var bedCost = parseInt(document.querySelector('#bed_cost').innerHTML || 0, 10);
  var bathCost = parseInt(document.querySelector('#bath_cost').innerHTML || 0, 10);
  
  document.querySelector('#prise_chendge').innerHTML = (basePrice + bathCost + bedCost).toFixed(2);
}


function getBedroomCost(val) {
  return basePrice_2 + bedroomCostFactor[val - 1];
}

function getBathroomCost(val) {
  return basePrice_3 + bathroomCostFactor[val - 1];
}

          <div class="prise">
            Цена:<span id="prise_chendge">28 900</span> руб.
          </div>
          
          
                  <div class="form__fields">
            <div class="form_text_fields">
              <span class="form_label">Ширина дивана </span><span class="choice_display" id="bed_display">100</span> м2 </div>
            <div class="form_text_fields none">
              <span class="form_label">Cost: </span><span class="choice_display" id="bed_cost">0</span> </div>
            <div class="form_input_field">
              <input type="range" min="1" max="6" value="1" class="slider" id="bed_service">
            </div>
            </div>
          <div class="form__fields">
        <div class="form_text_fields">
          <span class="form_label">Длинна дивана: </span><span class="choice_display" id="bath_display">100</span>м2
        </div>
        <div class="form_text_fields none">
          <span class="form_label">Cost: </span><span class="choice_display" id="bath_cost">0</span> </div>
        <div class="form_input_field">
          <input type="range" min="1" max="6" value="1" class="slider" id="bath_service">
        </div>
      </div>