This is a css problem; I've updated the default css, try putting to code below into the admin/plugins share css box:
#qa-share-buttons-container {
background: none repeat scroll 0 0 #DDDDDD;
font-size: 125%;
font-weight: bold;
margin: 20px 0;
padding: 20px;
text-align: center;
}
#qa-share-buttons {
vertical-align:middle;
}
.share-widget-container {
display:inline-block;
poisiton:relative;
}
.qa-share-button {
width: 54px;
}