the store() controller is not working in laravel 5.7 - php

Question

i am working on crating a post for my blog app. laravel 5.7 . but when i want to create a new post it dose not redarect to the index page of the post ...it is just refresh the crate page .......i don't know why its not working .......here is my create blade page
#extends('layouts.app')
#section('content')
<div class="card card-defualt">
<div class="card-header"> Create post</div>
<div class="card-body">
<form action="{{route('posts.store')}}" method="POST" enctype="multipart/form-data">
#csrf
<div class="form-group">
<label for="title">Title</label>
<input type="text" name="Title" class="form-control">
</div>
<div class="form-group">
<label for="description">Description</label>
<textarea name="description" id="description" cols="5" rows="5" class="form-control"></textarea>
</div>
<div class="form-group">
<label for="content">Content</label>
<textarea name="content" id="content" cols="5" rows="5" class="form-control"></textarea>
</div>
<div class="form-group">
<label for="published_at">Published At</label>
<input type="text" name="published_at" class="form-control">
</div>
<div class="form-group">
<label for="image">Image</label>
<input type="file" name="image" id="image" class="form-control">
</div>
<div class="form-group">
<button type="submit" class="btn btn-success">Create post</button>
</div>
</form>
</div>
#endsection
and post controller
public function store(createpostrequest $request)
{
$image=$request->image->store('posts');
post::create([
'title'=>$request->title,
'description'=>$request->description,
'content'=>$request->content,
'image'=>$image
]);
//flashing the message
session()->flash('success','catagory created successfully');
return redirect(route('posts.index'));
}
and here is the request
{
return [
//
'title'=>'required|unique:posts',
'description'=>'required',
'content'=>'required',
'image'=>'required|image'
];
}