Grim Stuck After Reaping

Every time a sim dies, Grim reaps them and then seems to be stuck, unable to move on my lot. I've tried adding him to my household and then removing him, moving my home lot entirely, and killing other sims to see if that will make him leave, but he remains stuck. He left at some point becuase my sim went on a blind date, but with the next death was stuck again.