Perhaps this is by design but I have forgotten once but each time I use the Loop Wizard it creates something like this
[wpv-layout-start]
[wpv-items-found]
<!-- wpv-loop-start -->
<wpv-loop wrap="3" pad="true">
[wpv-item index=1]
<div class=" ">
<div class="col-sm-4">[wpv-post-body view_template="Loop item in test for row class"]</div>
[wpv-item index=other]
<div class="col-sm-4">[wpv-post-body view_template="Loop item in test for row class"]</div>
[wpv-item index=3]
<div class="col-sm-4">[wpv-post-body view_template="Loop item in test for row class"]</div>
</div>
[wpv-item index=pad]
<div class="col-sm-4"></div>
[wpv-item index=pad-last]
<div class="col-sm-4"></div>
</div>
</wpv-loop>
<!-- wpv-loop-end -->
[/wpv-items-found]
[wpv-no-items-found]
<strong>[wpml-string context="wpv-views"]No items found[/wpml-string]</strong>
[/wpv-no-items-found]
[wpv-layout-end]
If this is not a bug it certainly caused me some confusion. btw it seems to happen on every site I have, and regardless of the bootstrap version selected.
This is not urgent but I noticed one other unresolved report, where the person opening the ticket resolved by deleting the offending row