FS-IA10B 10 Flysky FS-i6x/ Arduino uno R4/ Can not read channel 7-10

Using Arduino Project Guidance
1

Hi.
I connect flysky FS-i6X and FSIA10B receiver with Arduino UNO R4.

I can read channel 1-6 but I cannot read data from channel 7-10

This is my code.

int ch1; 
int ch2;
int ch3;
int ch4; 
int ch5;
int ch6;
int ch7; 
int ch8;
int ch9;
int ch10;
int speedA;
int speedB;
int m11=2, m12=3,m21=4,m22=7, speedPinA = 6, speedPinB = 5;

void setup() {

  pinMode(8, INPUT);
  pinMode(9, INPUT);
  pinMode(10, INPUT);
  pinMode(11, INPUT);
  pinMode(12, INPUT);
  pinMode(13, INPUT);
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(5, INPUT);
 



  Serial.begin(9600);
  pinMode(m11,OUTPUT);
  pinMode(m12,OUTPUT);
  pinMode(m21,OUTPUT);
  pinMode(m22,OUTPUT);
  pinMode(speedPinA,OUTPUT);
  pinMode(speedPinB,OUTPUT);
  digitalWrite(m11, LOW);
  digitalWrite(m12, LOW);
  digitalWrite(m21, LOW);
  digitalWrite(m22, LOW);



}

void loop() {

ch1 = pulseIn(8, HIGH, 25000); // อ่านค่าความกว้างของสัญญาณของแต่ละ Channel
ch2 = pulseIn(9, HIGH, 25000); 
ch3 = pulseIn(10, HIGH, 25000);
ch4 = pulseIn(11, HIGH, 25000);
ch5 = pulseIn(12, HIGH, 25000);
ch6 = pulseIn(13, HIGH, 25000);
ch7 = pulseIn(2, HIGH, 25000);
ch8 = pulseIn(3, HIGH, 25000);
ch9 = pulseIn(4, HIGH, 25000);
ch10 = pulseIn(5, HIGH, 25000);



Serial.print("Channel 1:");
Serial.println(ch1);

Serial.print("Channel 2:");
Serial.println(ch2);

Serial.print("Channel 3:");
Serial.println(ch3);

Serial.print("Channel 4:");
Serial.println(ch4);

Serial.print("Channel 5:");
Serial.println(ch5);

Serial.print("Channel 6:");
Serial.println(ch6);


Serial.print("Channel 7:");
Serial.println(ch7);

Serial.print("Channel 8:");
Serial.println(ch8);

Serial.print("Channel 9:");
Serial.println(ch9);

Serial.print("Channel 10:");
Serial.println(ch10);


Serial.println("");



}