Why Is This Cargo Container Emitting So Much Radiation?

In Genoa, Italy a radioactive cargo container appeared.  Nobody knew where it had come from, or where it was going, or what was in it.  It took a year to get rid of it.  It’s as if a pixel got stuck on, in the real world, not the digital world.  I have to imagine given how automated the container transshipping is in some ports, that you could almost treat the insertion of something like this as a software problem.  You just have to get a truck to pick it up without knowing who you are, or what you’ve loaded, and from there the 20 ton packet of reality moves, guided by a disembodied digital hand.