Running Rails 4.1.4 with the latest releases of haml, haml-rails, sass, and bootstrap-sass. For a user display, my HAML is as such:
.tutors-listing
.row
By the looks of it you are rendering all of the columns in a single row. You need to change it so that it starts a new row every 4 columns i.e. (in plain old erb)
<% @users.each_slice(4).to_a.each do |chunk| %>
<% chunk.each do |tutors| %>
...
<% end %>
<% end %>
You might not need the to_a on the first loop