Posts from categories all show text layer from revolution slider

When showing a collection of posts from a category there is not shown the text as excerp but the text of layers from revolution slider instead.

Every post has a revolution slider on top of the post. In categories there should not be the text layer from the slider. I think this is a bug.

Take a look at this example:
http://www.sunnydog.info/category/ernaehrung/
All exerpts begin with the same layered text of revolution slider but not with the text that is in the post.

Thanks for help
Frank