Stairs, Chests and other blocks placed in Item Frames are not rendered correctly, they can be seen in the wrong direction.
Stairs and chest will not show correctly on item frames
Chest in item frame shows wrong side facing forward.
Stairs in itemframes
Block Orientation in Item Frame
Blocks are sideways when placed into Item Frames (14w04b)
Items in item frame facing wrong way.
Certain Items are rotated 90° / 180° in hand and in hotbar / inventory