mixed up data in firebase database data

I am new to firebase and Android programming in general. In my app I'm simply saving fullName, password, phoneNumber, Email, gender and a confirmed password. All these fields get stored in the database but their mixed up

Users
+23407066082195
email: '0000'

fullName: '+23407066082195'

gender: 'male'

password: 'k..gmail.com'

phoneNo: 'Tim...'

retypedPassword: '0000'

this is my code : for the first activity

 btnSignUp = findViewById(R.id.btnSignUp);
 btnSignUp.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (!validateEdtName() | !validateEdtEmail() | !validatePhoneNumber() | !validateEdtPassword() | !validateEdtRePassword() | !validateGender()) {
                return;
            }
            progressBar.setVisibility(View.VISIBLE);
            selectedGender = findViewById(gender.getCheckedRadioButtonId());
            String gender = selectedGender.getText().toString();

            String myName = fullName.getEditableText().toString().trim();
            String myEmail = email.getEditableText().toString().trim();
            String myPassword = password.getEditableText().toString().trim();
            String myRetypedPassword = retypedPassword.getEditableText().toString().trim();

            String getUserEnteredPhoneNumber = phoneNumber.getEditableText().toString().trim();
            String phoneNo = "+" + countryCodePicker.getFullNumber() + getUserEnteredPhoneNumber;

            Intent intent = new Intent(SignUp.this, VerifyOTP.class);

            intent.putExtra("PhoneNumber", phoneNo);
            //intent.putExtra("fullName", fullName);
            intent.putExtra("myName", myName);
            intent.putExtra("myEmail", myEmail);
            intent.putExtra("myPassword", myPassword);
            intent.putExtra("myRetypedPassword", myRetypedPassword);
            intent.putExtra("gender", gender);

            startActivity(intent);

for the next activity: created a class to hold the strings which is the UserHelperClass

FirebaseDatabase rootNode = FirebaseDatabase.getInstance();
DatabaseReference reference = rootNode.getReference("Users");

UserHelperClass addNewUser = new UserHelperClass(fullName,phoneNo,password,email,retypedPassword,gender);
reference.child(phoneNo).setValue(addNewUser);

any suggestions will be helpful.

I analyzed your code. Either you haven't correctly initialized your EditTexts (maybe their ids aren't correct) or you haven't correctly implemented the constructor of UserHelperClass. Check both of them, you will probably see the bug.

P.S. I would encourage you to check Parcelable documentation. It is for sharing objects via intents.