Choices become n/a for other users than admin

I created a binary poll having 4 choices/ 1 answer. As an admin, everything shows up and works fine.
Given access to authenticated users to "vote on polls" and "view polls", an authenticated user sees the node, sees the 4 radio buttons, but instead of the choices' text he only sees n/a behind the radio buttons. Hard to vote, then.

I let the node object show up, and in some array leaves the choices' text appear, in others it doesn't. In short:

Here the choices appear (shortened code):

stdClass Object
(
[choice] => Array
        (
            [1] => Array
                (
                    [label] => My first choice
                )

Here it does not:

stdClass Object
(
[content] => Array
        (
            [poll] => Array
                (
                    [#value] => <form action="/wu-x/node/380"  method="post" id="advpoll_voting_binary_form-0" class="advpoll-vote">
<div><div class="poll">
<input type="hidden" name="ajax" id="edit-ajax" value=""  class="ajax" />
<div class="form-radios"><div class="form-item">
 <label class="option"><input type="radio" name="choice" value="1"   class="form-radio" /> n/a</label>
</div>

Here it does not either:

stdClass Object
(
   [#children] => <form action="/wu-x/node/380"  method="post" id="advpoll_voting_binary_form-0" class="advpoll-vote">
<div><div class="poll">
<input type="hidden" name="ajax" id="edit-ajax" value=""  class="ajax" />
<div class="form-radios"><div class="form-item">
 <label class="option"><input type="radio" name="choice" value="1"   class="form-radio" /> n/a</label>
</div>

I put a print_r($node) into the node-advpoll_binary.tpl.php file and send you the entire output as an attached file.