NEED HELP WITH PHISHING SETUP

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I'm having issues setting up my phishing campaign. I httracked the site I wanted, changed the script, so the credentials would be captured, and then hosted it. But I didn't know
how to assign each email/person to the credentials and also the way I captured the credentials was not too effective because I would just get username and PW. So I found 
Gophish, but now I'm facing the issue of my landing page not showing correctly. I put the folder of the website in \static\js\src\vendor\ckeditor\plugins\preview, but it still only shows the page correctly if I put an index.html as the landing page code that refers (href) to the page I really want. I tried connecting the gophish server (Ubuntu 20.04.5 LTS VPS) to the Domain I hosted with a PTR Record, that didn't work. Tried getting a new Domain, connecting it to the VPS with an PTR and A Record they connected but the website I put in the Gophish server (VPS) still doesn't show, it only shows a blank page if I put the index.html as the landing page and just the text if I put the code of the Site I want as the landing page, if I then press "view page source" it says: 

// Prevent from DOM clobbering.
if ( typeof window.opener._cke_htmlToLoad == 'string' ) {
    var doc = document;
    doc.open();
    doc.write( window.opener._cke_htmlToLoad );
    doc.close();

    delete window.opener._cke_htmlToLoad;
}


So my questions are, what could trigger "// Prevent from DOM clobbering."? Is there another way to get the Page I want as the landing Page? And how would I go if I want to assign each email/person to the credentials and also capture IP and Browser info? Or would it be easier to use the page I already hosted together with a beef hook?
I'll pay for help

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This is a bump

[19]

This is a bump

[19]

This is a bump