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You probably clicked disable signature when you posted your threads. You can go into advance edit and scroll down and click the box that says Show your signature. It should be near the disable smilies box.
Okay, click "Post Reply", then check below the reply box, below the "Submit Reply" and "Preview Post" buttons. There should be three checkboxes underneath, and one is "Show your signature". Is that checked?
Just tested it, those only show up if you have a signature.
I think I know your problem actually. You uploaded a signature picture, didn't you? To use a sig pic you have to put some text into the box as well. Try putting [SIGPIC][/SIGPIC] into the text box, and then saving it.