Using BMP280 sensor to control servos. Need some guidance with coding

Projects General Guidance
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Thanks again Martin for taking the time to help me out and providing all the very useful information. I am sorry that I am going to bug you again for a little bit of help.
I found some code online to create a debounce button, and I attempted to incorporate it to the State Machine code hoping that it would function.
After some trials and errors, I managed to clear the errors and allowed the codes to compile. However, unfortunately, I must have done something wrong here because when I uploaded the codes, the servos were activated immediately without me pushing the button. And the servo also didn't return to the original position after being activated. I couldn't figure out what's wrong and I hope you can help me find out.
Anyways, I would like to say thank you again; because of your help, I have felt more comfortable in trying out Arduino coding for the project and (at least I feel like) my skills are slowly improving.
I hope people that are building similar projects and are new to Arduino will find this post and the responses helpful too.

#include <Servo.h>
#include <BMP280_DEV.h>                           // Include the BMP280_DEV.h library

const int buttonPin = 2;    // the number of the pushbutton pin
const int ledPin = 13;      // the number of the LED pin

int ledState = HIGH;         // the current state of the output pin
int buttonState;             // the current reading from the input pin
int lastButtonState = LOW;   // the previous reading from the input pin

unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers


int servoPin1 = 9;
int servoPin2 = 10;
int servoPin3 = 11;
int servoPos = 0;

Servo Myservo1;                                   //define servos
Servo Myservo2;
Servo Myservo3;

float temperature, pressure, altitude;            // Create the temperature, pressure and altitude variables
BMP280_DEV bmp280;                               // Instantiate (create) a BMP280_DEV object and set-up for I2C operation (address 0x76)

enum StateMachine { DISARMED,
                    ARMED,
                    LAUNCH,
                    DEPLOY,
                    ABORT
                  } stateMachine = DISARMED;

bool armedInput = false, launchInput = false, abortInput = false;
bool servosActivated = false;

float threshold = 5.0f;   // Altitude above launch site in meters
float launchSiteAltitude;


void initializeBarometer()    {
  bmp280.begin();                                 // Default initialisation, place the BMP280 into SLEEP_MODE
  //bmp280.setPresOversampling(OVERSAMPLING_X4);    // Set the pressure oversampling to X4
  //bmp280.setTempOversampling(OVERSAMPLING_X1);    // Set the temperature oversampling to X1
  //bmp280.setIIRFilter(IIR_FILTER_4);              // Set the IIR filter to setting 4
  bmp280.setTimeStandby(TIME_STANDBY_1000MS);     // Set the standby time to 1 seconds
  bmp280.startNormalConversion();                 // Start BMP280 continuous conversion in NORMAL_MODE
}

void initializeServos()    {
  Myservo1.attach(servoPin1);                     // Connect Servos to arduino pins
  Myservo2.attach(servoPin2);
  Myservo3.attach(servoPin3);
}

void debounceButtonSetup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);

  // set initial LED state
  digitalWrite(ledPin, ledState);
}

void setup()
{
  Serial.begin(115200);                           // Initialise the serial port
  initializeBarometer();
  initializeServos();
  debounceButtonSetup();
  pinMode(buttonPin, INPUT);


}

void airbrakeGo()
{
  Myservo1.write(90);
  Myservo2.write(90);
  Myservo3.write(90);
}

void airbrakeClose()
{
  Myservo1.write(0);
  Myservo2.write(0);
  Myservo3.write(0);
}

float debounceButtonPush() {

  // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  // set the LED:
  digitalWrite(ledPin, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}

void loop()   {
  if (bmp280.getMeasurements(temperature, pressure, altitude))    // Check if the measurement is complete
  {
    Serial.print(temperature);                    // Display the results    
    Serial.print(F("*C   "));
    Serial.print(pressure);    
    Serial.print(F("hPa   "));
    Serial.print(altitude);
    Serial.println(F("m"));  
  }

  
  switch (stateMachine)
  {
    case DISARMED:
      armedInput = digitalRead(buttonPin);
      if (armedInput == true)
      {
        stateMachine = ARMED;
      }
      break;
    case ARMED:
      launchInput = debounceButtonPush();
      bmp280.getAltitude(launchSiteAltitude);
      if (launchInput == true)
      {
        stateMachine == LAUNCH;
      }
      break;
    case LAUNCH:
      altitude = bmp280.getAltitude(altitude) - launchSiteAltitude;
      if (altitude > threshold)
      {
        stateMachine = DEPLOY;
      }
      break;
    case DEPLOY:
      if (servosActivated == false)
      {
        airbrakeGo();
        servosActivated = true;
      }
      break;
    case ABORT:
      // Add abort code here...
      break;
    default:
      break;
  }
 

}

Thanks again :pray: