I was trying to construct some registers for my ALU, and I come across a weird bug (at least, I'm pretty sure it's a bug). It's kind of hard to explain, so I suggest looking at the pictures. Pretty much, if you put a glowstone tower right next to a block with a torch on it, even if you power the block the torch remains on. (This is with a glowstone tower that is OFF.) If such weren't the case, my register design would be perfect.

What I expected to happen was...:
The torch would be off since the block it is attached to is powered.

What actually happened was...:
The torch remained on.

Steps to Reproduce:
(Steps 1-4 can be skipped if you just reproduce what's in pictures "Setup" and "Setup (other side)")
1. Create a 2x1x1 (LxWxH) block with a torch and a piece of redstone on top.
2. Extend the block with glowstone on the side with redstone. Put redstone on the glowstone.
3. Have your redstone trail lead into a block with a torch on it.
4. Put a 3-high glowstone tower running adjacent to the other glowstone and the block with a torch on it. (Do not put redstone on the top.)
5. Break the redstone on the middle glowstone of the glowstone tower. This causes the torch to turn on for some reason; putting the redstone back doesn't fix it. In fact, if you just destroy the entire glowstone tower, the torch still doesn't update. (Shown in a pictures)