When hitting any land mob, gravity does not work the mob to its full extent. ( it's like gravity on the moon.)

When hitting any land mob, gravity does not work on the mob to its full extent (it's like gravity on the moon.)

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...