Button help

I used Frame labels on a MC to make an animated button…

i used:

[AS]

on(rollOver) {
this.gotoAndPlay(“over”);
}

on(rollOut) {
this.gotoAndPlay(“out”);
}

[/AS]

as actions on my buttons, but for some reason they get stuck in the over position some times, here is the FLA…
anyone know why?