Personal Safes not Personal...

No matter who places a personal safe on my server anyone can access it, whether they're an op or not, whether it was placed by an op or not...kind of inconvenient...can anyone help me figure out why?? Thanks...

I actually run two servers, one tekkit which is experimental, seeing if it is worthwhile, seeming to be problem filled so far, and the other a vanilla bukkit. similar stuff on both, but even with mostly everything disabled I can't seem to get it to work properly on either one, it's almost like I'm missing something simple...