Weird Behavior Of Knockout

<div id="ctlAlert" class="alert error-message">
<ul id="ctlAlertUL" data-bind="foreach: allErrors">
<li data-bind="text: $data" class="text-danger"></li>
</ul>
</div>

<button id="btnErr1">Err1</button>
<button id="btnErr2">No ERR</button>
HTML:

Script part:

<script>

$(document).ready(function () {

var ErrorsListModel […]

See original post by invalid@example.com (senglory)