Why are so many thread titles missing and or changed?

When time allows, I read a majority of the topics even though I may not have the opportunity to post or develop thoughts on the topic at the time of reading them. Today, when I look at the posts in this section, a number of them no longer have titles and then I see a post with a large number of replies that I was surprised that I missed... only to find out I was familiar with the topic, but strangely it was renamed.

I'm not sure what the reasoning is behind this, but it just makes following up on topics difficult.

I actually feel a little bad about posting this here, but I found it problematic enough that I had to bring it up.