At the bottom of each page of the forum there is a pair of links: “Show your topics/posts”.

When I click on “topics” I expected it to show me a list of all the threads I started. Instead I got a list of all the threads I'd posted on. That is what I expected for clicking on “posts”. In reality, both lists are the same, only the presentation is different.

For “topics” can we get the list of topics I've started?

I don't think there's a search facility for that yet, and “Show your topics/posts” is a special search that pretty much just automatically fills in your username. It would make more sense, though, if “topics” showed the topics you have made.