I can't offer any solutions and am writing just to say I have similar problems. I use Firefox browser on a computer but never log out. Whenever I re-visit I look through all the forums to make sure I find the most recent postings, relying on memory and familiarity with the topics that most appeal to me.
I've given up relying on this website's software to notify me about new postings or to take me to the latest posting in a thread to which I am subscribed. They're standard features on forum-based websites but this one's software appears buggy and unreliable.
I can't get on with viewing and pecking at the tiny screen of a phone.
