Pagination not working

Here's my code. When I dd($post) it shows 3 item but in view it shows all the 6 items I don't know. Neither it shows any error. I want to display only 3 posts.

public function categories($slug)
    {
        $category = Category::where('slug',$slug)->first();
        $posts = $category->posts()->paginate(3);
        $categories = Category::all();
        $title = $category->name;
        $settings = Setting::first();

        return view('category',compact('category','categories','title','settings','posts'));

    }

Here's the view

            <div class="row">
                @php
                    $i = 0;
                @endphp
                
                    @foreach($posts as $post)
                        <div class="case-item-wrap">
                            <div class="col-lg-4 col-md-4 col-sm-6 col-xs-12">
                                <div class="case-item" style="margin-top: 20px;">
                                    <div class="case-item__thumb">
                                        <img src="{{$post->featured}}" alt="our case">
                                    </div>
                                    <h6 class="case-item__title"><a href="{{route('post.single',['slug' => $post->slug])}}">{{$post->title}}</a></h6>
                                </div>
                            </div>
                        </div>
                        @php $i++; @endphp
                        @if($i % 3 == 0)
                            <div class="row"></div>
                        @endif
                    @endforeach