You haven’t provided a link for your website.
I know you’re using GamePress Pro but this is actually GamePress issue. I released updated version where this issue is fixed, you can download it from my website.
As for your question about centering the logo, you should download My Custom CSS plugin, and then go to My Custom CSS in admin panel and add these rules:
header #logo {float: none; text-align: center;}
header #logo h1 {float: none; }
Save and that should do it.