Links pagination redirecting me to index instead of keeping url

@MohamedTammam I just tweaked the css a bit of the pagination (using vendor:publish) and I get the results like is done in any controller. But I dont think it has nothing to do with this. Because it works on local but not when it's deployed to Heroku.

AdminDiscountController

<?php

namespace App\Http\Controllers;

use App\Models\Category;
use App\Models\Discount;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class AdminDiscountController extends Controller
{
    public function index()
    {
        return view('admin.discounts.index', [
            'discounts' => Discount::paginate(5)
        ]);
    }

    public function create()
    {
        return view('admin.discounts.create', [
            'categories' => Category::all()
        ]);
    }

    public function store()
    {
        $originalPrice = request('original_price');
        $discountedPrice = request('discounted_price');
        $percentage = 100 * ($originalPrice - $discountedPrice) / $originalPrice;

        $link = parse_url(request()->input('link'), PHP_URL_SCHEME) ? request()->input('link') : 'https://' . request()->input('link');

        Discount::create(array_merge($this->validateDiscount(), [
            'user_id' => request()->user()->id,
            'thumbnail' => request()->file('thumbnail')->store('discount_thumbnails'),
            'percentage' => $percentage,
            'premium' => 0,
            'link' => $link
        ]));

        return redirect('/')->with('success', 'Descuento creado con exito!');
    }


    protected function validateDiscount(?Discount $discount = null): array
    {
        $discount ??= new Discount();
        $originalPrice = request('original_price');
        $discountedPrice = request('discounted_price');
        $percentage = 100 * ($originalPrice - $discountedPrice) / $originalPrice;

        return request()->validate([
            'title' => 'required',
            'thumbnail' => $discount->exists ? ['image'] : ['required', 'image'],
            'slug' => ['required', Rule::unique('discounts', 'slug')->ignore($discount)],
            'body' => 'required',
            'original_price' => 'required|numeric|gt:discounted_price',
            'discounted_price' => 'required|numeric|lt:original_price',
            'category_id' => ['required', Rule::exists('categories', 'id')],
            'link' => 'required',
        ]);
    }

    public function edit(Discount $discount)
    {
        $categories = Category::all();
        return view('users.discounts.edit', [
            'discount' => $discount,
            'categories' => $categories
        ]);
    }

    public function update(Discount $discount) {
        $attributes = $this->validateDiscount($discount);

        if($attributes['thumbnail'] ?? false) {
            $attributes['thumbnail'] = request()->file('thumbnail')->store('discounts_thumbnail');
        }

        $discount->update($attributes);

        return back()->with('success', 'Descuento actualizado!');
    }

    public function destroy(Discount $discount)
    {
        $discount->delete();

        return back()->with('success','Descuento eliminado!');
    }
}

@MohamedTammam By the way if I add the url manually the ?page=2 works for admin/discounts it's just it redirects me to index?page=2 for no reason when it shouldnt.

@ignaaaam What are the displayed URLs for {{ $discounts->links() }}?

@MohamedTammam The URLS are okay. I think its what people said about .htaccess i'll update later if it's that or not. Thanks anyways.

@Snapey Oh didnt tought about it, it must be something like this I guess.

This is what i have at the moment, i'll see later if it's this what causes it because it's what has more sense to be causing the error.

<IfModule mod_rewrite.c>
    <IfModule mod_negotiation.c>
        Options -MultiViews -Indexes
    </IfModule>

    RewriteEngine On

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} (.+)/$
    RewriteRule ^ %1 [L,R=301]

    # Send Requests To Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]

    #add this on public/.htaccess for Laravel
    RewriteCond %{HTTPS} !=on
    RewriteCond %{HTTP:X-Forwarded-Proto} !https
    RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
</IfModule>

@Snapey but he mentioned that, if he write the URL himself it works fine.