Put the summary of the bug you're having here

What I expected to happen was...:
I place lava above a bubble elevator and the water to turn into obsidian.

What actually happened was...:
I placed the lava bucket into the top water source and the water swapped out for lava and the lava just floats there instead of flowing down and into the water.

Steps to Reproduce:
1. Make a soul sand bubble elevator
2. ...Put honey on two sides
3. ...Glass on other sides

4) Copy the picture I include.

5)Place lava onto the top water source