why SimpleAudioEngine::sharedEngine()->playEffect(effectpath) play effect twice ?

why SimpleAudioEngine::sharedEngine()->playEffect(effectpath) play effect twice ?
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#1

why SimpleAudioEngine::sharedEngine()->playEffect(effectpath) play effect twice ?
cocos2d-x version: cocos2d-x-1.0.1
os: linux
could anyone help me, please ?