Throttle Middleware fails on multiple ajax test

I am using laravel 5.6, the following resources are used

Route::any('throttle3', function(){ return response()->json(['status'=>'success','message'=>'asasas']); })->middleware('throttle:1,0.25');

I have added 4 ajax request in a js function when I call the function first 3 of the request get success and last one request get blocked by Throttle.

in my concept first request is to be succeeded and another 3 got blocked by Throttle.

Is there any idea to achieve this?