Continuing the discussion from Discourse Version 1.7:
The bounce rate of our forum has spiked from 20% to 70%, and that of our landing page from 9% to 81% since Nov 23.
My engineer colleague @Sean_Lin (and @alex_song) suggested that it is because when a visitor comes to our forum, and reads several pages, GA thinks that this visitor stays in the same page, without detecting any url change. His speculation is supported by this graph:
I am hoping someone can verify his idea or tell me what caused the changes (and how I can read the reports accurately.)