Hello ı have website created html,css and nodejs, before deploy vercel ı deployed my apps to heroku and localhost and tried to run and everything works perfectly , but when ı deploy vercel`` my app and try to logout in node js my website is just refresh the page sometimes logout but mostly refresh the page and not delete jwt token and not logout Node-js

const logout = async(req,res,next) => {
  try {
     res.clearCookie("jwt")
     await req.user.save()
  } catch (error) {
    res.json(error)
  }
}

and my login route

const loginUser = async(req,res,next) => {
 
  const {nickname, password,phone} = req.body
  const user = await User.findOne({
    nickname,
    

  })
 
  if(await bcrypt.compare(password,user.password)) {

    const token = jwt.sign({
      id:user._id,
      nickname:user.nickname,
      role:user.role
    },
      process.env.JWT_SECRET
    )
   
    res.cookie('jwt', token, { expires: new Date(Date.now() + 3000000), httpOnly: true })
    
    return res.json({status: 'ok', data:token})

  }
  return res.json({status: 'error', error: 'Böyle bir kullanıcı adı/şifre bulunamadı!'})
}