Weird bug with thread

It shows Doubleshotgun as replying a few minutes ago, when they actually replied a week ago. I'm fairly certain this was triggered when I edited my post and added another version of my cart to it.

So basically:

1. make a post
2. someone comments
3. edit the post
4. thread says they replied at the timestamp when you edited post

I think this has been a bug since forever. And yes, annoying.