title: bootstrap col-xs-* not working
body: <p>Never had this issue before. Go to <a href="http://quanjiaerp.azurewebsites.net/" rel="nofollow noreferrer">this website</a>. As you can see, "sss" and "sssss" are put in two divs with class "col-xs-*". They should appear on same row, not sure why it's not working. 
  <a href="https://i.stack.imgur.com/LKLpa.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LKLpa.png" alt="enter image description here"></a></p>