Recently delved into the world of Bootstrap 4 and its responsive grid system. Everything seemed to be going smoothly with my columns and resizing windows, until I encountered an issue on xs screensize where all columns automatically spanned 12 instead of 4-4-4 as intended. Despite scouring the internet for a solution, I have come up empty-handed. Any help would be greatly appreciated. It's strange that my closing html tag isn't displaying.
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
<div class="row">
<div class="col-xs-4 col-sm-8 col-md-12 col-lg-4 box1">1</div>
<div class="col-xs-4 col-sm-2 col-md-6 col-lg-4 box2">2</div>
<div class="col-xs-4 col-sm-2 col-md-6 col-lg-4 box3">3</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity="sha384-
KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script
src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper
.min.js" integrity="sha384-
ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script
src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.
js" integrity="sha384-
JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>