Collision with liquid

[Mackiiboy]

I have been bug testing my map and encountered some interesting phenomena with liquid. Some entities that collides with liquid, bounces up and down for an eternity like the first image. Some entities, for example a dead pig, freaks out totally, flying around in the air and changing its shape like the second image.






Since this is not kinda realistic, I am trying to get rid of this problem. I know that some entities does not have this behavior, like barrels etc. The question is which settings entities that works good with liquid has.
If you know, please make a comment. Otherwise I can just remove the liquid-areas to get rid of the problem.