How to stop if-statements conflicting each other? and how to make a program complete an if-statement before it does anything else?

I am creating a programme that uses DC motors to change gears on a bike. I have one DC motor for the rear set of gears ie 1-9 and I have a DC motor for the middle gears ie 1-3. The problem I have is that when I'm switching from gear 9 to gear 8, I press a button and the motor just keeps running forever.

This is my gear nine function:

void GearNine() {   //CHANGE FROM GEAR 9-10, or 10-9
  int target = 888;   // TARGET FOR GEAR 10

  // read the pushbutton input pin:
  buttonState = digitalRead(buttonPin);
  //  buttonState2 = digitalRead(buttonPin2);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    //if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button went from off to on:
      
      //Turn on motor A
      MotorA_Forwards();
      MotorB_Backwards();
     }
  }
  if (pos >= 838) {   //GO TO GEAR 1 ON MOTOR 1
      MotorAOff();   //TURN MOTOR OFF
  }
  if (pos2 <= 50){   //GO TO GEAR 1 ON MOTOR 2
      MotorBOff();   //TURN MOTOR OFF
      buttonPushCounter2++; //ADD TO GEAR COUNTER
  }
  
  
  
//      delay(50);
  lastButtonState = buttonState;
    Serial.print(" Motor target: ");
    Serial.print(target);
    Serial.print(" pos1: ");
    Serial.print(pos);
    Serial.print(" pos2: ");
    Serial.print(pos2);
    Serial.print(" Gear: ");
    Serial.print(buttonPushCounter2);
    Serial.println();


        buttonState2 = digitalRead(buttonPin2);

  // compare the buttonState to its previous state
  if (buttonState2 != lastButtonState2) {
    //if the state has changed, increment the counter
    if (buttonState2 == HIGH) {
      
      // if the current state is HIGH then the button went from off to on:
      //Turn on motor B
      MotorB_Backwards();

      if (pos2 <= 7050) {   // WAS IN GEAR 9 BUT GO BACK TO GEAR 8
        MotorBOff();
        buttonPushCounter2--;  //MINUS 1 FROM GEAR COUNTER: WAS 9, NOW 8
      }
    }
  }
//  if (pos2 <= 7050) {   // WAS IN GEAR 2 BUT GO BACK TO GEAR 1
//  MotorBOff();
//  buttonPushCounter2--;  //MINUS 1 FROM GEAR COUNTER: WAS 2, NOW 1
//  }
  
  lastButtonState2 = buttonState2;
  lastButtonState = buttonState;
    
    Serial.print(" Motor target: ");
    Serial.print(target);
    Serial.print(" pos1: ");
    Serial.print(pos);
    Serial.print(" pos2: ");
    Serial.print(pos2);
    Serial.print(" Gear: ");
    Serial.print(buttonPushCounter2);
    Serial.println();

}

As you can see near the bottom I have these lines of code to make the gear run back down to gear 8 after the line of code that says MotorB_Backwards();:

if (pos2 <= 7050) {   // WAS IN GEAR 9 BUT GO BACK TO GEAR 8
        MotorBOff();
        buttonPushCounter2--;  //MINUS 1 FROM GEAR COUNTER: WAS 9, NOW 8
      }

If I have these lines of code here, the motor won't stop running if the button is pressed. Where as If I have the code where I have commented it out below these lines, then the if statement conflicts with this if statement which is slightly above in the code:

if (pos >= 838) {   //GO TO GEAR 2
      MotorAOff();   //TURN MOTOR OFF
  }
  if (pos2 <= 50){
      MotorBOff();
      buttonPushCounter2++;
  }

The reason it conflicts with these if statements is that if I want to go to gear 10. Motor A will go to pos 838 but motor B wont go down to pos2 of 50, instead it will stop at pos2 of 7050, because these if statements conflict with each other. So basically I'm not sure if my if statement is correct or if I'm putting it in the correct place or even wondering if there is a better way of doing this.

Maybe a simpler explanation/question would be how can I make an if statement complete what is within the if statement before it moves down the code. So I would like this if statement to be completed before it reads the next if statement:

if (pos >= 838) {   //GO TO GEAR 2
      MotorAOff();   //TURN MOTOR OFF
  }
  if (pos2 <= 50){
      MotorBOff();
      buttonPushCounter2++;
  } 

This is the if statement I don't want the program to run before its finished with the if statement above:

if (pos2 <= 7050) {   // WAS IN GEAR 9 BUT GO BACK TO GEAR 8
        MotorBOff();
        buttonPushCounter2--;  //MINUS 1 FROM GEAR COUNTER: WAS 9, NOW 8
      }

Much appreciated for anyone's help. Thank you.