Expired token when valid a form Laravel - laravel

Question

I'm stuck for a while on this subject, I've searched the internet but unfortunately I can't find anything.
I have a controller that sends a recipe to my database but when I click on the previous icon of Google, it re-displays me the data entered previously are again displayed. Except that I have implemented csrf and from what I understood it allowed not to return to the form that has already been sent.
No sensitive information gets through but that's mostly because I don't like the user to be able to review his previously sent data...
Here is my controller
function index(){
return view('recette');
}
function saveRecette(Request $req){
$req->validate(
[
'nomRecette'=>'required',
'nbrPersonnes'=>'required|regex:/^[0-9]+$/',
'facilite'=>'required',
'detail'=>'required',
'ingredientPrincipal' => 'required',
],
[
'required'=> 'Ce champ est obligatoire',
'nbrPersonnes.regex' => 'Le champ doit contenir que des nombres'
]
);
$idRecette = Str::uuid();
$recette = new Recette;
$recette->id = $idRecette;
$recette->nomRecette = $req->nomRecette;
$recette->nbrPersonnes = $req->nbrPersonnes;
$recette->facilite = $req->facilite;
$recette->detail = $req->detail;
$recette->created_at = now();
$recette->updated_at = now();
$recetteSave =$recette->save();
if($recetteSave){
$listIngredient = $this->getIngredient($req->all());
foreach($listIngredient as $ingredient){
$ingred = new Ingredient;
$ingred->id = Str::uuid();
$ingred->ingredient = $ingredient;
$ingred->idRecette = $idRecette;
if($ingred->save()){
}
}
return redirect('');
}
return redirect()->back()->withInput()->with('bug', "Un problème est survenue. Veuillez réessayer plus tard");
}
function getIngredient($list){
$listIngredient = [];
$i=0;
foreach($list as $ingredient => $de){
if(strpos($ingredient, 'ingredient') !== false){
$listIngredient[$i] = $de;
$i++;
}
}
return $listIngredient;
}
Here is my Model
use HasFactory, Notifiable;
protected $table='creationRecette';
public $incrementing = false;
/**
* The attributes that are mass assignable.
*
* #var array
*/
protected $fillable = [
'id',
'nomRecette',
'nbrRecettes',
'facilite',
'detail'
];
/**
* The attributes that should be cast to native types.
*
* #var array
*/
protected $casts = [
'created_at' => 'datetime',
'updated_at' => 'datetime'
];
Thanks a lot :)