nodeapi problem

I now have 3 custom modules, and each one a nodeapi function, each one has a different name

in fashion.module I have fashion_nodeapi(&$node, $op, $teaser, $page)
in feature.module I have feature_nodeapi(&$node, $op, $teaser, $page)
in slideshow.module I have slideshow_nodeapi(&$node, $op, $teaser, $page)

and each one contains switch ($op) with case 'insert'; and case 'update';

the problem is when I create a new node with one module, it exectues the code from the 'insert' case in ALL 3 MODULES!!!!!!

why is that? and how can I stop it? I figured since each module has it's own nodeapi function with a different name there shouldn't be this kind of cross talk between the different modules

thanks in advance for any help with this!