Figured this one out.
I had to change the CSS property of the dropdown to display: none
instead of absolute positioning -99999px left.
Here is my code:
.chzn-container .chzn-drop {
width: 100% !important;
display: none;
background: #f6fbfd;
border: 1px solid #9fbeca;
border-top: 0;
position: absolute;
top: 100%;
left: 0;
z-index: 900;
width: 100% !important; /*to line up the right side visually*/
-moz-box-sizing : border-box;
-ms-box-sizing : border-box;
-webkit-box-sizing: border-box;
-khtml-box-sizing : border-box;
box-sizing: border-box;
Then I just set the value to inline here:
.chzn-container.chzn-with-drop .chzn-drop {
left: 0;
display: inline;
}