Angular - Webpage redirect to homepage when opening external URL

Whenever I open an external URL from my webpage, this webpage redirect to homepage. The external URL gets open in new tab but the webpage from which I am opening the external URL it redirect to homepage. I don't know why this is happening I tried all the possible but couldn't get rid of it.

xyz.html

<a (click)="goToLink('https://www.example.com/abc')">page link</a>

xyz.ts

goToLink(url: string) {
  window.open(url, "_blank");
}

Comments

[Indian Train]

There is also not found rule in my website. If any URL which is not from the website it will redirect to not found page. You can have a look on my website indiantrain.in/, and let me know the correct way for adding external link.