I have a similar problem with my dual screen setup although I don't quite know what you mean by bombs.
The KDE splash screen has 4 or 5 animated icons that are placed in a crescent shape around the Vector moon when loading GUI. When I setup dual displays and booted into GUI the splash screen worked. When I changed the default desktop to my right hand monitor the Vector graphic still appears on the left while the right monitor has a hashed background with animated icons displayed in rough patterns over the background.
Should you worry? I don't know. But, if these really are pictures of bombs then this might be the start of a virus. We should name it the Great Vector Virus of 2012. Oh what a story this would be for our grandchildren.