Animation repeating at different frames
 

Hi,I am a newbie with Maya and I'm following this video 'animating a character throwing a ball in autodesk maya 2014'
( https://www.youtube.com/watchv=XII9aKbVXrgfor) for bucket kid.At frame 10,I have to rotate the arm and the wrist but after i do it,I see that the position of the arm on frame 1 also changes.My settings are - Autokey is turned on ,'On character sets' is 'Key modified attributes' and Playback speed is 'Real-time(24fps)'.Please help.

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