RSS Feed/News Usernames AC AutoSubmit Behavior Oddities

[ENXF NET]

I have a form field, with a username search field. This field has an AC autosubmit function:
Code:

<xf:form action="{{ link('ewr-medio/add-user', $media) }}" class="block" ajax="true" data-xf-init="medio-taguser">
    <div class="block-container">
        <h3 class="block-minorHeader">{{ phrase('EWRmedio_add_user') }}</h3>
        <div class="block-body block-row">
            <xf:textbox name="usernames" ac="single" id="media-adduser" data-autosubmit="true" />
        </div>
    </div>...

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