Select form input issue

I wrote a form in which I have some

<perch:label for="dose_melange">Précisez les doses du mélange d'aloe arborescens</perch:label>
 <perch:input class="chosen-select" id="dose_melange" type="select" options="3 cs par jour, 6 cs par jour ou plus" />

but when post the form any of my select inputs appear. Other inputs work perfectly. Have to mention i deleted the class="chosen-select"(using some js stuff) but didn't resolve the issue.