I had that happen before too on a Native 1920 by 1080p Monitor.
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This happens to me when my browser isn't maximized but its a non issue when I maximize it.
As Drew said, only happens when browser isn't maximised.
thank you @aod_zed
I'm not sure if you're familiar with vBulletin, but the fix is a bit more involved than simply making changes to the html.
Archangel is making some other modifications to the forum, so I will coordinate with him to see if we can potentially deal with this as well.
There is another topic where it was discussed.