How to solve onDelete('cascade') not working?

I'm using Laravel 5.8.

my migration :

  public function up()
    {
        Schema::create('category_emergency', function (Blueprint $table) {
            $table->bigInteger('emergency_id')->unsigned();

            $table->bigInteger('category_id')->unsigned();

            $table->foreign('emergency_id')->references('id')->on('emergencies')

                ->onDelete('cascade');

            $table->foreign('category_id')->references('id')->on('categories')

                ->onDelete('cascade');
            $table->engine = 'InnoDB';

        });
    }

when I delete a category it doesn't delete the emergency related to it?

I'm using belongToMany relationship.

I have tried to set the engine to InnoDB but not working

And it's not showing any kind of errors:

Am I doing something wrong Here?

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