Steps to reproduce:
- Build a grave, and change whether it holds animal corpses.
- Save the game.
- Load the game.
Found this out when my colonists, upon resuming a game, would empty out the graves I'd filled with animal corpses. Other settings, e.g. priority and human corpses, are unaffected. Gibbet cages are likewise affected.
It's also worth noting that gibbet cages have the same three main buttons as graves, but only have "Stranger corpses" in their detailed stockpile settings.
Thanks for reporting added it to mantis (http://ludeon.com/mantis/view.php?id=344)