电脑上一切正常，一次登录就能进，用iPhone7真机调试时必须点两次登录才能进，而且第一次报错,第二次正常，什么情况。。我的密码先是md5加密，和这个有关系吗

js:

Page({
  data: {
  },
  onSubmit:function(event){
    var value = event.detail.value;
    var phoneNumber = value.phoneNumber;
    var password = value.password;
    this.setData({
      phoneNumber: phoneNumber,
      password: password
    })
  },
  login(event) {
    var that=this;
    var phoneNumber = that.data.phoneNumber;
    var password = that.data.password;
    var utilMd5 = require('../../utils/md5.js');
    var password = utilMd5.hexMD5(password); 


    wx.showLoading({ title: '登录中...' });
    wx.request({
      url: 'xxxxxxx',
      method: 'POST',
      header: {
         "Content-Type": "application/x-www-form-urlencoded"
      },
      data: {
        phoneNumber: phoneNumber,
        password: password
      },
      success:function(res) {
        wx.setStorageSync('sessionid', res.cookies[0]),
        console.log(res);
        wx.switchTab({ 
          url: "/pages/download/download"
        });
      },
      fail:function(){
        console.log('账号或密码错误')
      }
    })
  }
})

wxml:

<view class="login-container">
<form bindsubmit='onSubmit'>
  <view class="section-container">
    <image class='image' src='https://s1.ax1x.com/2020/04/01/G1DZWR.png'></image>
    <input class="common-input" name="phoneNumber" placeholder="请输入账号/手机号"></input>
  </view>
  <view class="section-container">
    <image class='image' src='https://s1.ax1x.com/2020/04/01/G1B5RI.png'></image>
    <input class="common-input" name="password" password placeholder="请输入密码"></input>
  </view>
  <view class="btn-area">
    <button class="btn" form-type='submit' style="background:#3775F6; color:white" bindtap="login">登录</button>
  </view>
</form>
</view>