Form action wrapper being removed entirely

Comparing the buttons on the mysite.com/cart and mysite.com/cart/checkout pages, it looks like the bootstrap theme is stripping out the wrapper around the buttons. For example here is the difference between Bartik and Bootstrap for the /cart page:

Bootstrap:

<a href="/">Continue shopping</a>
<button class="btn btn-info form-submit" id="edit-update" name="update-cart" value="Update cart" type="submit">Update cart</button>
<button class="btn btn-default form-submit" id="edit-checkout--2" name="op" value="Checkout" type="submit">Checkout</button>

Bartik:

<div class="form-actions form-wrapper" id="edit-actions">
<a href="/">Continue shopping</a>
<input type="submit" id="edit-update" name="update-cart" value="Update cart" class="form-submit">
<input type="submit" id="edit-checkout--2" name="op" value="Checkout" class="form-submit">
</div>

The div wrapping the anchor tag and the buttons does not appear in the bootstrap theme.

I also attached a comparative screen shot.

Bonus question: I'm curious about where the extra bootstrap classes are coming from in the bootstrap theme. How is the "btn-info" and "btn-default" applied?

Thanks for any help! :)