Image will not stay in container or col

I cant find anything wrong with my code, that would take my image out of the container

it just all of a sudden happened

<div class="col-md-2" style="float: right;">
                <img class="featurette-image img-responsive" src="/static/images/mangsidebar.png" alt="Generic placeholder image" style="height: 100%; width:auto">
            </div>

and its within

<div class="col-md-12">

but its now massive and hanging outside the box