Quote from ASE1245:
The options your looking at come from strikes that trade with a dividend or special adjustment. After these adjustments, very few public orders come in except to close. Your looking at the last sale, not the bid/ask average, which is where most end of day and midday pricing come from. Also, if an option meets certain criteria, to save on bandwidth, a market maker is not required to post a market, so the last sale/current value, does not change even when the stock price changes.