<p dir="auto">I may be totally off on this, but I wanted to point it out...</p>
<p dir="auto">I noticed that on the "Customize" page, you can set the @screen-sm-min, @screen-md-min, @screen-lg-min variables, as well as the @container-sm, @container-md and @container-lg variables. But after compiling it, I still seem to be getting the default break-points on the container width for small and medium.</p>
<p dir="auto">So on the customize page, if I enter...<br>
@screen-sm-min = 992px<br>
@screen-md-min = 1200px<br>
@screen-lg-min = 1600px</p>
<p dir="auto">@container-sm = 970px<br>
@container-md  = 1170px<br>
@container-lg  = 1570px</p>
<p dir="auto">I end up with...</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="@media (min-width: 768px) { /*Should be 992px*/
  .container {
    width: 970px;
  }
}
@media (min-width: 992px) { /*Should be 1200px*/
  .container {
    width: 1170px;
  }
}
@media (min-width: 1600px) {
  .container {
    width: 1570px;
  }
}"><pre class="notranslate"><code class="notranslate">@media (min-width: 768px) { /*Should be 992px*/
  .container {
    width: 970px;
  }
}
@media (min-width: 992px) { /*Should be 1200px*/
  .container {
    width: 1170px;
  }
}
@media (min-width: 1600px) {
  .container {
    width: 1570px;
  }
}
</code></pre></div>
<p dir="auto">This will make the container wider than the screen on small and meduim. I think the issue may be that in the less files, they are referencing @screen-sm instead of @screen-sm-min (same for md) for the container width.</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="// Set the container width, and override it for fixed navbars in media queries
.container {
  .container-fixed();

  @media (min-width: @screen-sm) { /*Should be @screen-sm-min?*/ 
    width: @container-sm;
  }
  @media (min-width: @screen-md) {/*Should be @screen-md-min?*/ 
    width: @container-md;
  }
 @media (min-width: @screen-lg-min) {
    width: @container-lg;
  }
} "><pre class="notranslate"><code class="notranslate">// Set the container width, and override it for fixed navbars in media queries
.container {
  .container-fixed();

  @media (min-width: @screen-sm) { /*Should be @screen-sm-min?*/ 
    width: @container-sm;
  }
  @media (min-width: @screen-md) {/*Should be @screen-md-min?*/ 
    width: @container-md;
  }
 @media (min-width: @screen-lg-min) {
    width: @container-lg;
  }
} 
</code></pre></div>
<p dir="auto">When customizing bootstrap (e.g. <a href="http://getbootstrap.com/customize/?id=7880081" rel="nofollow">http://getbootstrap.com/customize/?id=7880081</a>) and setting<br>
@screen-md-min = 1280px<br>
@screen-lg-min = 1900px<br>
@container-md = ((1220px + @grid-gutter-width))<br>
@container-lg = ((1860px + @grid-gutter-width))</p>
<p dir="auto">it will generate the default @screen-md-min 992px instead of 1280px bootstrap.css (line 700)</p>
<div class="highlight highlight-source-css notranslate position-relative overflow-auto" dir="auto" data-snippet-clipboard-copy-content="@media (min-width: 768px) {
  .container {
    width: 750px;
  }
}
@media (min-width: 992px) {// WRONG
  .container {
    width: 1250px;
  }
}
@media (min-width: 1900px) {
  .container {
    width: 1890px;
  }
}"><pre class="notranslate"><span class="pl-k">@media</span> (<span class="pl-c1">min-width</span><span class="pl-kos">:</span> <span class="pl-c1">768<span class="pl-smi">px</span></span>) {
  .<span class="pl-c1">container</span> {
    <span class="pl-c1">width</span><span class="pl-kos">:</span> <span class="pl-c1">750<span class="pl-smi">px</span></span>;
  }
}
<span class="pl-k">@media</span> (<span class="pl-c1">min-width</span><span class="pl-kos">:</span> <span class="pl-c1">992<span class="pl-smi">px</span></span>) {<span class="pl-c1">/</span><span class="pl-c1">/</span> WRONG
  .<span class="pl-c1">container</span> {
    <span class="pl-c1">width</span><span class="pl-kos">:</span> <span class="pl-c1">1250<span class="pl-smi">px</span></span>;
  }
}
<span class="pl-k">@media</span> (<span class="pl-c1">min-width</span><span class="pl-kos">:</span> <span class="pl-c1">1900<span class="pl-smi">px</span></span>) {
  .<span class="pl-c1">container</span> {
    <span class="pl-c1">width</span><span class="pl-kos">:</span> <span class="pl-c1">1890<span class="pl-smi">px</span></span>;
  }
}</pre></div>