Laravel Auth: password doesn't match after logout - laravel

Question

User password changes in Laravel 8 after a period of time post logout, maybe a day or more. When I look into the database, the password hash has changed. I used the default Laravel authentication and had this issue, so I wrote the login code below, but still, I have the issue.
LoginController
public function login(Request $request)
{
$email_username = filter_var($request->username, FILTER_VALIDATE_EMAIL) ?
'email' : 'username';
$request->merge([$email_username => $request->username]);
if (Auth::attempt($request->only($email_username, 'password'))) {
return redirect()->intended($this->redirectTo);
} else {
return view('auth.login')
->with('these credetials do not match our records.');
}
$user = User::where($email_username, $request->username)->get();
if ($user && Hash::check($request->password, $user->password)) {
$request->session()->regenerate();
auth()->login($user);
return redirect()->intended($this->redirectTo);
}
return redirect()->back();
}
User Model
class User extends Authenticatable
{
use HasFactory, Notifiable;
public function partners()
{
return $this->hasMany('App\Models\partner');
}
protected $fillable = [
'username',
'profilepic',
'firstname',
'lastname',
'password',
'email',
'title',
'phone',
];
protected $hidden = [
'password',
'remember_token',
];
protected $casts = [
'email_verified_at' => 'datetime',
];
}
and this is the method that registers user.
public function store(Request $request)
{
$request->validate([
'username' => ['required', 'string', 'max:255', 'unique:users'],
'profilepic' => ['required', 'image', 'mimes:jpeg,png,jpg,gif,svg,ico', 'max:2048'],
'firstname' => ['required', 'string', 'max:255'],
'lastname' => ['required', 'string', 'max:255'],
'password' => ['required', 'string', 'min:8'],
'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
'title' => ['required', 'string', 'max:255'],
'phone' => ['required', 'min:10'],
]);
if ($request->profilepic != null) {
$profilepic = $request->firstname . ' ' . $request->lastname . '.' . $request->profilepic->extension();
$request->profilepic->move(public_path('/global_assets/images/users/'), $profilepic);
}
$user = new User([
'username' => $request->get('username'),
'profilepic' => $profilepic,
'firstname' => $request->get('firstname'),
'lastname' => $request->get('lastname'),
'password' => Hash::make($request->get('password')),
'email' => $request->get('email'),
'title' => $request->get('title'),
'phone' => $request->get('phone'),
'isAdmin' => $request->get('isAdmin'),
'isActive' => $request->get('isActive'),
]);
$user->save();
return redirect()->back()->with('success', 'New user has been created.');
}