Problem with redirecting

Hi,
when you call my website cvfs.chorstein.de , you can see red “V” on the right side of “Verein” and “Konzertchor”. When you call it from chorvereinigung-stein.de, which is redirected to the wordpress subdirectory, then you see little boxes instead of the “V”´s. Whats the problem?

Another problem is that I want to call the website without redirection. But then all the customization-stuff won´t work. I always get the message that i have been logged out, but thats not true. When I go back to the dashboard I´m still logged in. Whats the problem?
Where do I have to change paths to get it working? I dont´want to move the site.
Regards Wolfram