FOX - Currency Switcher Professional for WooCommerce

Plugin link: https://iconicwp.com/products/sales-booster-for-woocommerce/

• Into file wp-content\plugins\iconic-woo-sales-booster\inc\checkout\class-order-bump-at-checkout-manager.php add next code

  $bump_price = $bump->get_discount_price($product_id);
  if (class_exists('WOOCS') AND $bump_price) {
      global $WOOCS;
      if ($WOOCS->is_multiple_allowed) {
          $currrent = $WOOCS->current_currency;
          if ($currrent != $WOOCS->default_currency) {
              $currencies = $WOOCS->get_currencies();
              $rate = $currencies[$currrent]['rate'];
              $bump_price = $bump_price / $rate;
          }
      }
  }