Need help with my nodemcu project

Need Help With My Project
1

im making a school project with 2 power window, mdd10a dual driver and nodemcu. However. both motor wont go backwards, it only goes forward right and left in my blynk. Help please? heres my code:

#include <Blynk.h>
#include <Servo.h>

#define BLYNK_PRINT Serial


#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>


// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "a57b0e58d63941eaa9d63c6fa200b99c";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "KKK";
char pass[] = "kenken999";

#define m11 D0  //pwm1
#define m12 D3  //dir1 
#define m21 D7  //pwm2
#define m22 D6  //dir2 
Servo servo1;

void forward()
{
  analogWrite(m11, 300);
  analogWrite(m21, 300); 
  digitalWrite(m12,LOW);
  digitalWrite(m22,LOW);
}

void backward()
{
  digitalWrite(m11,LOW);
  analogWrite(m12,300);
  digitalWrite(m21,LOW);
  analogWrite(m22,300);
}

void right()
{
  analogWrite(m11, 300);
  digitalWrite(m12,LOW);
  digitalWrite(m21,LOW);
  digitalWrite(m22,LOW);
}

void left()
{
  digitalWrite(m11, LOW);
  digitalWrite(m12,LOW);
  analogWrite(m21, 300);
  digitalWrite(m22,LOW);
}

void Stop()
{
  digitalWrite(m11, LOW);
  digitalWrite(m12,LOW);
  digitalWrite(m21,LOW);
  digitalWrite(m22,LOW);
}

void setup()
{
  servo1.attach(15);
  // Debug console
  Serial.begin(115200);
  // Set console baud rate
  Serial.begin(9600);
  delay(10);
  // Set ESP8266 baud rate
  // 9600 is recommended for Software Serial
  delay(10);

  Blynk.begin(auth, ssid, pass);
  pinMode(m11, OUTPUT);
  pinMode(m12, OUTPUT);
  pinMode(m21, OUTPUT);
  pinMode(m22, OUTPUT);
}

BLYNK_WRITE(V1) 
{
  int x = param[0].asInt();
  int y = param[1].asInt();

  // Do something with x and y
/*  Serial.print("X = ");
  Serial.print(x);
  Serial.print("; Y = ");
  Serial.println(y);*/
   if(y>220)
  forward();
  else if(y<35)
  backward();
  else if(x>220)
  right();
  else if(x<35)
  left();
  else
  Stop();
}

BLYNK_WRITE(V0)//     
{
 int motorSpeed = param.asInt(); 
  analogWrite(m21,map(motorSpeed,0,100,0,255)); 
  analogWrite(m11,map(motorSpeed,0,100,0,255));
}

void loop()
{
  Blynk.run();
}