Clicking on a button opens multiple new tabs instead of only one
I have this strange problem that started to happen recently, and have no idea how to fix it.
In Adobe Animate I created an animated HTML5 banner in HTML5 canvas, with button in it that leads me to an URL when I click that button.
But the problem is when I click that button it opens multiple new tabs instead only one. (Like this in the picture)

The way I created a button is on a new layer i created new rectangle with dimensions of whole canvas,
converted it to a new symbol (button), double click it to enter that symbol, and created a keyframe only on HIT state.
Then returned to "Scene 1", clicked on a button, put an instance name on that button and in code snippet wrote this code:
this.btn_name.addEventListener("click", fl_ClickToGoToWebPage);
function fl_ClickToGoToWebPage() {
window.open("http://www.adobe.com", "_blank");}
(ofc instead of adobe.com I put my own URL)
This method worked for me until now. But all of a sudden this problem started to appear.
I tried in 2 different versions of Adobe Animate (2018 & 2019) but the issue is still here.
And the interesting thing is that problem occurs only when I select "Loop timeline" in "Publish Settings..."
Without "Loop timeline" checked it works just fine.
I'm really stuck in limbo with this ![]()
