I don't know what you're seeing exactly. Don't see any red X's with padlock as you described, just one X but no padlock that says remove post, and that will appear on only your posts or replies whether you start the topic or not. If you remove your posts, well, you can't get them back so use your judgment there.
Do a Windows Update and/or try the Google Chrome browser to see if the problem goes away. If not, I wouldn't worry about it if it's not causing problems.