Lava moving too fast in snapshot 13w21a

Put the summary of the bug you're having here
the Lava Flow is moving too fast it is moving more if it was water
What I expected to happen was...:
I expected the lava to flow like normal

What actually happened was...:
I created a new world and found a lava fall. I went over to it but the lava flow was moving extremely fast

Steps to Reproduce:
1. go in a world
2. fined moving lava
3. then you will see the lava flow moving extremely fast