Bootstrap thumbnail grid not starting a new row correctly

Bootstrap thumbnail grid not starting a new row correctly

I have a grid of thumbnails oin my rails app but I am having trouble
getting bootstrap to display the grid correctly! As you can see below
however it is not starting a new row correctly! not sure what to do here.
I've included my HTML below and as far as I can see it conforms with the
bootstrap examples.
<div id="image-grid" class="col-lg-10">
<div class="row">
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/1">
<img alt="Img 0259"
src="/system/images/images/000/000/001/thumb/IMG_0259.JPG?1369368826">
2013-05-24
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/3">
<img alt="Img 0034"
src="/system/images/images/000/000/003/thumb/IMG_0034.JPG?1369649370">
2013-05-27
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/2">
<img alt="Img 0008"
src="/system/images/images/000/000/002/thumb/IMG_0008.jpg?1369649198">
2013-05-27
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/4">
<img alt="Rsz 1971061 10153145204760484 336557482 n"
src="/system/images/images/000/000/004/thumb/rsz_1971061_10153145204760484_336557482_n.jpg?1377656209">
2013-08-28
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/5">
<img alt="Digital radiograph1"
src="/system/images/images/000/000/005/thumb/digital_radiograph1.jpg?1377659810">
2013-08-28
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/6">
<img alt="Pamo"
src="/system/images/images/000/000/006/thumb/pamo.jpg?1377659876">
2013-08-28
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/7">
<img alt="Tooth x ray 1"
src="/system/images/images/000/000/007/thumb/tooth-x-ray_1.jpg?1377659952">
2013-08-28
</a> </div>
<div class="col-sm-6 col-md-2">
<a class="thumbnail text-center" href="/images/8">
<img alt="Fig9b"
src="/system/images/images/000/000/008/thumb/fig9b.jpg?1377664192">
2013-08-28
</a></div>
<div class="col-sm-6 col-md-2">
<span class="glyphicon glyphicon-plus">
<a href="/images/new">Upload New Image</a>
</span>
</div>
</div>
</div>