slick-track causing overflow

Not sure this is 100% related to the module and not the library itself. I'm getting a white space (horizontal scroll) to the right. This can best be shown with a couple screenshots.

This is what it looks like in the viewport. Notice the whitespace to the right.

I've tried using overflow-x: hidden; which works, but it causes issues in IE. I'm only supporting >IE9.

Any suggestions/ideas would be awesome.

Thanks - Scott