I can see the problem now. You just need to remove the offset classes because an offset is done by increasing the margin which in return increases the element's width and renders the total width of both the sidebar and the dashboard bigger than the total width and thus being pushed down.
Change this:
<div class="col-sm-9 col-sm-offset-3 col-md-10 col-md-offset-2 main">
To this:
<div class="col-sm-9 col-md-10 main">
Here is a working demo with the fix.