Over the years, various bugs and exploits in EVE have been used to create deep safe spot bookmarks. Those methods were fixed in the Tyrannis expansion, but existing bookmarks continued to function. After Tyrannis, any warps to locations far outside the solar system were supposed to automatically fail. On May 18th, bookmarks and items outside this range were also meant to be moved to within the bounds of the solar system. When that date came, however, no items were moved and the illegal bookmarks continued to function as normal. CCP has recently announced that the safe spot fixes detailed in their April devblog will be enacted on Tuesday August 10th. If you have any items or ships stashed away at a deep safe spot, you have until Tuesday to collect them. After that, they'll be moved closer to the system and start showing up on people's directional scanners.