Check if the Form is Actually Being Submitted

Add a name attribute to the submit button to make sure it gets submitted, even if the browser requires it.

Ensure the Form Method is Correct

Your form uses the correct POST method, but make sure the corresponding controller method (store) is set up to handle POST requests:

Route::post('/sales/store', [SalesController::class, 'store'])->name('sales.store');

Final Check: