Your code fires off several directions requests in a burst.
Some time later, some results mat come back in any random order.
A result may arrive while your code is in the middle of processing
another; they are all indistinguishable so the processing may go
screwy.

There is a speed limit to directions requests.

> Update - The functionality above was working correctly last April.

Pure fluke I suppose, the code as given will never work reliably.

You need to process one directions call at a time, taking requests off
of a stack.
Check the response, if it was rejected try adding a delay time.
When stack empty, do the final process.

The principle is outlined in this v2 example
http://econym.org.uk/gmap/geomulti.htm

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