Hostile mob sounds continue to play after their dead

When I killed off all the burning zombies and skeletons and spiders outside of my house, I was expecting them to be gone for good and I wouldn't have to hear them again.

What actually happened was the zombies and skeletons and spiders died, but I continued to hear the sounds playing over and over, such as burning zombies and skeletons, and the noises they make when idle, along with the spiders noises.

Steps to Reproduce:
1. Kill any hostile mobs