I am not sure why your tabs still integrate while you choose on top mode. To make sure its not a bad install issue. Please try purge and reinstall steps as mention here : [Link]. Just make sure to redownload the latest version from your account page. Reboot after the purge. Reinstall and reboot again after the installation. Retest and report back here.
Thank you,
Basj,
Stardock Community Assistant.