Known problem. Has been asked many times here. There is a mismatch between 
what TaskQueue API makes you believe it can do and what it actually designed 
to do. TaskQueue cannot guarantee execution timing. Your problem is actually 
pretty easy to reproduce when you do a task chain with countdown=0 
parameter. Vote up the following issue (feature request for a predictable 
timing TaskQueue)

http://code.google.com/p/googleappengine/issues/detail?id=4901 

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