Note: I am a Senior Product Designer at Stack Overflow
You are not the first person to point this out. This is something we've wanted to address for a while, unfortunately this particular project has two problems:
It's a low priority for the development team.
The code surrounding commenting is a confusing tangled mess and would probably need re-written.
This type of inconsistency should be fixed. However, we're currently very short staffed in the design department(i.e. Jin), and I'm afraid we probably won't get to fix this for a while.
Though, I will say that we are still looking to hire a designer, so if you feel that strongly you can apply :)