I see! I just tested it and I can confirm the problem. The easiest solution for now would be to go to:
components/com_comment/joscomment/emoticons/modern/index.php
and change the symbols needed for that icon to something else.
original
$GLOBALS["JOSC_emoticon"][';))'] = "Wink-2.gif";
change to
$GLOBALS["JOSC_emoticon"][':wink:'] = "Wink-2.gif";
The problem is that we use the php function str_replace and because the first icon is

it just replaces that and doesn't check further.
I'll see how other people have solved that and fix it in the next version.
Thanks!
Daniel