Problems on CCMoveTo

CCActionInterval *actionTst = CCMoveTo::actionWithDuration(2, ccp(100,100));
It means to move the sprite to 100,100, right?
But if i put this to the close button in the HelloWorld scene, like:
pMenu->runAction(actionTst);
it becomes to move relatively.
Why?

btw, why FPS displayed on the left bottom side becomes no more than 30 while i didn’t set the FPS