Strange behavior of Tabs GK4ver. 1.6

I have a unsolved problem on my site: http://www.megustavino.es/
Even if it is in Norwegian you will understand my problem. Over the main module (header) I have the Tab module. You see two tabs. 1.) "Månedens tilbud" (the offer of the month). 2.) "De siste vinene" (the latest wines).
Those tabs are managed in the Tabs GK4 module. And here is the problem:

If I change the place of the to tabs (just change order) I will not see the content of "Månedens tilbud"

I have tried to make a exact copy of "De siste vinene" and place that into any tab, with the same result. It will NOT SHOW.

Please come up with some guess.

Drop it. I have found another solution