It has nothing to do with css wrap.
You can see the content boxes are individual divs, it could be due to margin or padding.
I am not able to replicate your issue, I need to be able to replicate the issue, in order to provide a fix.
The viewport on the affected machines is 1440 x 730 on the latest pc version of IE.
I assume you are referring to IE 11.
I will get our developer to take a look, hopefully they can replicate your issue and provide a fix.