user16460: I voted to close a question being too-broad (as far as I remember) but the close reason got changed. The system now states that the close reason is that the question was 'unclear'.

From help I found a special ability of the moderators:

Moderators can perform large-scale maintenance actions such as merging questions and tags, tag synonym approvals, and so forth.

So was this merging a part of that?

user6307: The close reason displayed is the one selected by the majority of voters. 

16460: <p>I voted to close a <a href="https://biology.stackexchange.com/questions/56942/alabamas-legendary-lizards-what-species-are-they">question</a> being too-broad (as far as I remember) but the close reason got changed. The system now states that the close reason is that the question was 'unclear'.</p>

<p><a href="https://i.stack.imgur.com/vjVCa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vjVCa.png" alt="enter image description here"></a></p>

<p>From <a href="https://biology.stackexchange.com/help/site-moderators">help</a> I found a special ability of the moderators:</p>

<blockquote>
  <p>Moderators can perform large-scale maintenance actions such as <strong>merging</strong> questions and tags, tag synonym approvals, and <strong>so forth</strong>.</p>
</blockquote>

<p>So was this merging a part of that?</p>
 6307: <p>The close reason displayed is the one selected by the majority of voters. </p>
