Update: search results are now ranked by bump or last post time, whichever more recent. Previously they were ranked by last post time only.

Please show me a screenshot demonstrating how Last Post is wrong.

As for Rank, a topic is ranked according to the topic starter's bump time, or a third party's reply time (whichever comes later). A topic starter's own reply to his topic no longer bumps a topic.

The "last post" column has been changed to literally mean when the last post was made. I can understand that after 10 years looking at the topic lists with the previous bump implementation, it is weird looking at a "last post" column that looks unsorted. But it's actually correct now, whereas in the past it was a lie, sort of

Anyway, I plan to remove the Last Post column completely as it isn't useful info for the buyers to know. Only the time of seller's last action (bump/edit/reply) will be shown.

You can't. The Trade Zone ranking dynamics have changed: a seller's reply doesn't bump his own thread anymore, in exchange for fewer restrictions on seller posts (for example, "you got PM" is allowed now). So there is no longer a direct association with the old behavior anymore.

Sorry that was a mistake, I accidentally removed it while fixing the search feature sorting. I have also made the bump feature direct you back to your previous screen

When you bump a topic, other topics you have in the same subforum will be de-bumped by 30 minutes. This is to prevent the front page from being dominated by one seller's topics.