"Next unread topic"

[Peckris 2]

In some forums - e.g. Items for Sale - I was paging through endless supposedly unread topics (the "Next unread topic" button was at the bottom of every topic which should only be there for actual unread topics).

Eventually - after wondering why so   many people were selling stuff - I noticed the dates of each topic were a few years old! Has there been a software change very recently?