Frame not showing all content when gone to via button

Hi. I'm having a problem with my school project where when I try to go to frame 20, it just shows the blue background rather than all of the content that is on the frame. I can't see anything wrong with my code, and I just frankly can't find a solution, can anyone help?

The screenshot above shows the main page. The first button is the button I am attempting to use to jump to the next frame.

This is frame 20, as you can see, there is a lot more on there than a blue background.

This is the code I have used for the button:

this.stop()

this.btnCampA.addEventListener("click", fl_ClickToGoToAndStopAtFrame_2.bind(this));

function fl_ClickToGoToAndStopAtFrame_2()

{

this.gotoAndStop(20);

}

this.btnGWA.addEventListener("click", fl_ClickToGoToWebPage);

function fl_ClickToGoToWebPage() {

window.open("https://www.games-workshop.com/", "_blank");

}

this.btnDOWIII.addEventListener("click", fl_ClickToGoToWebPage_2);

function fl_ClickToGoToWebPage_2() {

window.open("https://www.dawnofwar.com/", "_blank");

}