objective c - Cocos2d update:(ccTime)dt giving screwed up values -

inside of class subclasses ccnode, have scheduled -update:(cctime)dt method. have bunch of behavior objects don't subclass ccnode, have -update:(cctime)dt method. here's inside of ccnode's update method:

-(void)update:(cctime)dt{     for(behavior *currentbehavior in behaviors){         [currentbehavior update:dt];     } } 

when nslog dt value passed ccnode's update, prints out normal values (0.116699, 0.162726). however, when nslog dt value inside behaviors' update methods, printed numbers of sudden screwed (0.000, 36893488147419103232, -2.000). it's strangest thing. when debug it, i'll see first dt value normal, , i'll step inside behavior's update, , value change crazy. what's going on?

i figured out. didn't have -update:(cctime)dt in behavior class's .m file, , theory took complier time method selector, therefore screwed cctime.