Unfortunately I don’t have a Surface Tablet so there is no way for me to check whats going on at this moment. I haven’t heard of this issue before, but I’ll send an email to a couple people to see if anyone owns a Surface Tablet to check.
Keep in mind, it’s possible it could just be a bug within the Surface tablet itself. Mobile and tablets browsers render sites in their own way, so if that’s what the issue is, then there isn’t much I’d be able to do since the problem would be from their end. They would have to update their code for the browser. I’m not saying that’s what the issue is, but I thought I’d point that out since this has been the case many times before in the past, especially with Microsoft browsers (mobile, tablets, and desktops). Hopefully I can find someone with access to one of these tablets to check so we can see if the issue is from our end.
Also, if you can, please post a link to your site so others will be able to check what’s going on exactly.