Hot posts change or bug?

[DrBiggles]

Until recently, hot posts was cleared only if clicking on ‘Mark as Read’

Now the list is cleared a day after it is last viewed.

[theotherhalfofdh]

I just noticed this too. I was reading the France board last time I signed on which was about a week ago, I think. I didn't finish reading all the posts. Now they don't appear in hot posts. I only see new posts since I last signed off. This is a bug. It never happened before. I'm using IE as my browser if that is important.