For every direction except east, all stair textures are messed up. On west, a stair in front of a block has textures that are not lined up. (Screenshots). For north and south, I don't even know whats going on. And corner stairs, well, just check the screenshots! I saw bugs like this on 15w33, but my version is 15w44b and it is still a bug.
MC-91936
Stair Textures
Resolved
Duplicate
0
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-91710. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.