Put the summary of the bug you're having here
What I expected to happen was...:
The stairs would be the normal texture
What actually happened was...:
the stair texture is got weird lines in it on the top the sides.
Steps to Reproduce:
1. We just placed down a cobblestone stair and the texture was like that while facing west in the nether
This issue has been reported already. It has been linked to the original bugreport.
Please search before reporting any bugs, as it's likely that one exists already.