Finite State Algorithm

It looks like, you get some old values to the input.

$('#reberTextfield').keyup(function() { // Check value in textfield
    $('#startBtn').on('click', function() { // Submit value if start button is clicked
        var value = $('#reberTextfield').val(); // <<<<<<<<<<<<<<< move it here
        currentState.dispatch('changeState', [{ type: value }]);

        $('#reberTextfield').val(''); // Clear input
    });
});