We output an Articles Field with the default option 'Title', i.e. the title of the linked article. However, the HTML code also encloses the output with a span tag:
<span class="field-value "><a>Title of the articlex</a></span>
That wouldn't be a problem, but there are also spaces between the last article and the closing span tag:
<span class="field-value "><a>Title of the articlex</a> </span>