[SOLVED] Problems with sidebars

hello @ all,

First large praise to the developers of this Theme. It does not leave desires open.
I have however a few problems with the Sidebars left and right:
If I click a button right, is afterwards the left sidebar away. Turned around the same.
If I click an article in the center, both disappeared. I would like however that both are always visible. The Link is www.nebelkerzen.net What can I do or who can help me?
Thanks in advance for your help.

René