The conversation's method 'between' is not giving the correct count

[FSElias]

The following code is not giving the correct result

<?php
        // there are 2 ChatBot models in the database
        $conversation = Chat::createConversation([User::find(1), ChatBot::find(1)])->makeDirect();
        $conversation = Chat::createConversation([User::find(1), ChatBot::find(2)])->makeDirect();
        $conversations = Chat::conversations()->between(User::find(1), ChatBot::find(1));
        dd($conversations->count());

Please why I am getting 2 instead of 1?