Possible error in the homepage image

The image on the homepage that I am trying to build using your Pop Rock theme is duplicated and I have not yet been able to get rid of the "background image" that should not be there. The picture is repeated in a larger format behind the picture that I intend for the homepage. Is there a feature that I am missing or is this a bug in the theme? (Check the left and right sides of the image to see that it is repeated in the background) Thanks for your help. Francisco de Lacerda www.vallentunablasorkester.se