I'm making a responsive website in which I have 3 columns, two of the same width stacked on top of one equal to their added widths. This is my code for these columns:
<div class="container">
<div class="row" style="margin: 0 auto;">
<div class="col-sm-4 custom-offset sellers">
<div class="panel panel-default">
<div class="panel-heading paneltop"><strong>Event Information</strong></div>
<div class="panel-body" style="text-align: left;">...
</div>
</div>
</div>
<div class="col-sm-4 sellers">
<div class="panel panel-default">
<div class="panel-heading paneltop"><strong>Authorized Ticket Sellers</strong></div>
<div class="panel-body" style="text-align: left;">...
</div>
</div>
</div>
</div>
</div>
<div class="container">
<div class="col-sm-8 custom-offset sellers">
<div class="panel panel-default">
<div class="panel-heading paneltop"><strong>Where Do the Proceeds Go?</strong></div>
<div class="panel-body" style="text-align: left;">
...
</div>
</div>
</div>
</div>
When I resize the window without DevTools open/set to Responsive, my columns wrap and stack on top of each other, as they're supposed to. For instance, if I resize my window to roughly ~480px wide, the columns stack on top of each other with a bit of padding in-between. However, when I open DevTools and set my device to iPhone 6 Plus (with a width of ~415px), the columns stay in the 2-on-top-of-1 format that they were originally in.
Why do resizing the window and going Responsive on DevTools behave differently? I feel like pictures would get my point across much better, but I don't have that option as my reputation is a bit low.
Any help is greatly appreciated!