Livewire with Modal - Window

Dear Friends,
i have a problem with Modal - Windows in Livewire 2.2 and Laravel 8. The Web-App on Laravel-Server (php artisan serve -> http://127.0.0.1:8000) works perfekt. After upload to Web-Server or Testing by XAMPP (htdocs) open the Modal - Windows not. What is the problem and who can help me?

Thank you very much!