I don't know what IPC::ShareLite implements, so here are the generic questions:

Are you sharing the data between different machines? Different byte order?

Are you using different versions of Perl and/or Storable.pm in your two scripts?

Is IPC::ShareLite prepending some data to the result of $share->fetch?

Update: After looking at the documentation, I don't see any bad warnings, so I guess that somewhere your memory gets corrupted, as the Storable version number seems a bit weird.