If you place a specific block (redstone_repeater, etc).... it will place it in the opposite direction. (placing to the north puts the position to the south)
I noticed this after trying to make something with redstone.
How to reproduce:
1. Try to place a redstone repeater (or any block that can face north,south,east,or west)
2. It will face the opposite direction.
Duplicate of MC-56951 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.