Slimes are not positioned correctly. They are offset slightly north-west-up. I can't think of any other way to explain this, so I made a short video here: https://youtu.be/8DUTGyhvL8w
How to reproduce -
Place down a block
Summon a slime within the block, using the command
/setblock ~ ~ ~2 stone
/summon Slime ~ ~ ~2 {NoAI:1,Invulnerable:1,Size:1}
Look at the slime. It's slightly sticking out of the block, but not by the same
amount from each side.
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Meh cannot find what is causing this, it all seems to be 'ok' :/

@grum
If it helps, I know that it's not the rendering of the slimes that's off. Their actual position, or at least their hitbox, is offset.
I'll have a look through the 1.8 source code and see if I can find anything myself.
Whoo found it.