Thread "read/unread"changes after being logged out

[Sinistria]

When i get logged out of the forum automaticaly and i log in again,
it shows me threads as read but i did not read them yet.

As long as i am in the forum and switch through threads everything is fine but
after being logged out it is a bit messed up.

I have to check very exactly when a thread was last edited via the time stamps but it would be nicer to just have the bolt characters.

Is there something i can do about?