data is deleted when immediately after being added when add value listener is added

I'm using firebase real-time database I'm using checkboxes to add wen checked and deleted when unchecked like this :

 @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
        switch (compoundButton.getId()) {
            case R.id.borrowing:
                if (b)
                { addToList("borrowing");
                Log.i("checked","b is"+b);
                } else {
                    deleteFromList("borrowing",b);
                    Log.i("unchecked","b is"+b);
                }
                break;
            case R.id.reading:
                if (b)
                {addToList("toRead");
                }else{
                    deleteFromList("toRead",b);
                }
                break;
            case R.id.lending:
                if (b){addToList("lending");
                }else {
                    deleteFromList("lending",b);
                }
                break;
        }
    }

and I add data to fire base like this :

public void   addToList(String id ){
    df.child(uid).child(id).push().setValue(Id).addOnCompleteListener(new OnCompleteListener<Void>() {
        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()){
                Toast.makeText(getContext(),"Your data is updated",Toast.LENGTH_LONG).show();
            }else {
                Toast.makeText(getContext(),task.getException().getMessage(),Toast.LENGTH_LONG).show();
            }
        }
    });}

and deletedata like this :

public void deleteFromList(String id, final boolean b){
    df.child(uid).child(id).orderByChild(Id).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            if (!b) {
                for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
                    if (dataSnapshot1.getValue().equals(Id)) {
                        dataSnapshot1.getRef().removeValue();
                        Toast.makeText(getContext(),"Your data is deleted",Toast.LENGTH_LONG).show();
                    }
                }
            }
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

added, }

the problem is when I add data after the addvaluelister is attached the the data is immediately deleted after being added , what is the problem here and how to fix that ??