I am working on a custom Listview for android that holds togglebutton (working on an alarm application)

Question

The problem I am having is that the OnCheckedChangeListener is being called if I scroll, and randomly switching the toggle state for other items in the list. I have worked a way around this for now(loading the state for the toggle button from a database field) but I do want an explanation as to why the OnCheckedChangeListener for the togglebutton is active while scrolling, so I don't run into problems later. Right now this is all I am doing with the code to test it.

btnToggle.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {

            Log.d("", "" + model.getId());

        }   
    });