I'm trying to display a View in a Bootstrap 3-column format, and my first attempt of it, the individual columns are presented in a stacked order.
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I suspect I'm not configuring something correctly, but looking at the HTML markup, I'm under the impression that the div classes 'col-sm-XXXXX' are pre-defined in Bootstrap and should take on the form of a column by default, but is actually stacked.
Since you are using the bootstrap classes it would be best to check to see if Toolset is importing bootstrap. Now this setting you wouldn't need to worry about if your theme is bootstrap based.
What you can do is to go to Toolset -> Settings and scroll to Bootstrap Loading and check if Toolset is loading the Bootstrap 3 css.
This is usually the first step that we want to check when we see that the bootstrap classes are not working.