Lava turns water into stone instead of cobblestone when flowing onto the water from above

Intended.

Flowing Lava + Stationary Water = Stone
Flowing Water + Stationary Lava = Obsidian
Flowing Lava + Flowing Water = Cobblestone

ah i see thanks man

No problem, Yoyo! 🙂

Are you not able to do a simple Google search?

"Minecraft lava over still water" gives me this search result:

https://www.google.com/search?q=Minecraft+lava+over+still+water

And the first Wiki link is this:

http://minecraft.gamepedia.com/Lava

And within that wiki there is a section called "Lava and water"

The contents of that section say (and I quote)

"
If lava flows on top of still or running water, it creates stone.
If lava flows horizontally into water, cobblestone is created. Using this you can create cobblestone farms.
If water flows horizontally into lava, a hiss and puff of smoke occur but nothing changes.
If water flows vertically into lava, cobblestone or a hiss may result.
If water flows into a lava source block then obsidian is created. The lava spring is destroyed in the process, so unlike cobblestone it is not continuous and renewable.
If vertically falling water touches a lava source block on any side obsidian is created - even if the water would not run into the lava's square.
"

So please, save some time on the moderators by doing a quick Google search. Bug reports marked as duplicates I can understand sometimes, because there could be the same bug in different environments and you yourself may take that as a completely different bug, but just please do a quick Google search for something this basic.