[Forum] What's new results show both new and old threads

[Adom7]

I think I am missing something in admincp. When I click on new posts/whats new, all unread threads are listed on search page, after I read some of them then again I look for new posts but the old ones are still there. Not like here.

What do I check for it?
Thanks

[Charlie_Brown]

Change the database of read posts.

Thread/Forum Read Marking Type

This option controls how threads and forums are marked as read.

Click the help icon on the right for more information on each option.

Inactivity/Cookie Based
Database (no automatic forum marking)
Database (automatic forum marking)

I use the bold.

[Adom7]

You are the man, Charlie, thank you.
Inactivity/Cookie Based was for mine, now the third one.