Truthfully, I'd seriously consider the diode as well. While they're currently working, you are subjecting the LED's to reverse voltages in excess of their maximum ratings. Most LED's have a 5V to 7V maximum reverse voltage rating, if you have 14 VAC on them, the peak reverse voltage they're exposed to is over 19 volts. That far exceeds their rated maximums and will likely result in much shorter life for the LED.
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