Mobs sinking in ground when pushed or get off minecart

Happens on any game mode. Every time mobs get off a minecart or are pushed, they start to sink into the ground. It is really annoying, especially when you are trying to get them to do something. They also jump and look at the player, looking like they're saying "omg omg help me im dying". If this is supposed to happen, that's weird, and you should remove it.