Double alert from one alert()

Hello, all,

I've got a weird glitch that I can't quite track down.  Here is some pseudo-code:

<select id="status_A"><option value="0">Unverified</option><option value="1">Verified</option><option value="2">Unsubscribed</option></select>
<select id="status_B"><option value="0">Unverified</option><option value="1">Verified</option><option value="2">Unsubscribed</option></select>
<select id="status_C"><option value="0">Unverified</option><option value="1">Verified</option><option value="2">Unsubscribed</option></select>
...
<script src="/path/to/jquery/jquery.min.js"></script>
<script>
     $('[id^="status_"]').on('change',function(){
          var $thisVal = $(this).val();
          alert($thisVal);
          });
</script>

When a select is changed, for example the first select is changed from the default Unverified to Verified, I will get an alert that displays "1", and then when I close that alert another alert (with no value displayed) pops up.  Any ideas what might be causing this?

V/r,

^ _ ^