Elegant Grunge: Disorientated pictures while using captions

Hi,
I use the theme Elegant Grunge since many months. But I have one problem: If I use a caption below my pictures, the complete picture is out of range. It not centerd in the text, it is completly disorientated. Regardless setting the picture to center, leftside, “none” or rightside. If I delete the caption, evrything looks fine.
Has anyone an idea how to fix that?

regards
thephantom