This translates to <div ...><div ...><div...>...
which is not what you put above in HTML.
The following should work:
(% class="row" %)(((
(% class="col-xs-… %)((()))
(% class="col-xs-… %)((()))
(% class="clearfix visible-xs-block" %)((()))
(% class="col-xs-… %)((()))
)))
Note the new lines, to get a DIV instead of a SPAN.