Maybe I am just missing something. But the top of forums page for me says - STICKY TOPICS WITH NEW POSTS.
It has three threads, with and without new posts.
I have sticky threads with the thumb tack icon saying it is sticky. Some with or without new posts and they do not show on top.
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Your browser/os information:
Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; TNJB; rv:11.0) like Gecko (this will help us make sense of your bug report)