If quantity doesn't fall in the defined brackets, wrong price is assigned to the item.

I used the price table to offer discounts on quantities that exceed a certain amount, for instance price X for 100-1000, and Y for 1000-unlimited, then if I added 1 item, it would wrongly assign the price of the last item or of the price row with unlimited defined in it. To tackle the issue, in the method 'commerce_price_table_get_amount_qty' in 'commerce_price_table.module', I replaced:

// Handle the unlimited qty.
 foreach ($items as $item) {
     if ($item['max_qty'] == -1) {
       return $item;
     }
 }

// We fallback to the higher one if no match was found.
 return end($items);

with

// Handle the unlimited qty.
  foreach ($items as $item) {
    if ($quantity >= $item['min_qty'] && $item['max_qty'] == -1) {
      return $item;
    }
  }

// We fallback to the higher one if no match was found.
  return false;

But this should also take into account if the actual/base price is disabled, which it doesn't for now. I would have probably made validation checks to see if quantities covered 1-unlimited if base price was disabled beforehand.