ok, there you go. You may have accidentally created it, or your update method might not be working right and creating a duplicate instead of editing the original

@snapey

public function create()
    {
        return view('news.create');
    }

public function update(Request $request, News $news)
    {
        if(auth()->user()->id !== $news->user_id){
            abort(401, "Please Login");
        }

        $this->validate($request,[
            'subject'=>'required|min:10',
            'body' => 'required|min:20'
        ]);

        $news->update($request->all());

        return redirect()->route('news.show', $news->slug)->withMessage('News Updated');
    }

How can i avoid the duplicate content?

That update method is passed the existing news instance which you then update, so it won't be that.

@snapey what do you now suggest or think the problem is??

Does anyone have solutions to this?

well it depends what you are doing when a duplicate appears? All you have said is that one of the news items is a duplicate.

Did that happen recently? Does it keep happening? Could it have been created when you were developing your code?