Call function after tween is done?

ok so i’m using mcTween2 for a project, i have movie clips animating in to start with then at a certain point i use a onTweenComplete to call a preload function. it all works to a certain point, once the function gets called the preloader starts fine but then after a few seconds the function gets called again so the preloader starts over and never actually loads anything, just keeps looping around. the only thing calling the preload function is that tween.

anyone ever have this problem before / know how to fix it?