In your website I see that the dark grey bar above the forum acts as a menu bar for various pages within the forums. Forums/Members/Recents Posts/My Profile/Logout and Search.
When it's on our website, the grey bar is empty, there is no login or register link either when logged out.
See the attached screenshot
Please navigate in Dashboard to Appearance > Menus admin page. Select the wpForo Navigation, then check/enable it for wpForo Menu location.
Also please read wpForo Menu Doc:
That's great. Thanks for your help. Excellent support!