BB Torch :: Deleting Some Messages On Inbox?

I have a BB Torch. When a message comes in on my phone, it is displayed at the center beneath the clock. I click to open. Then just below where the box shows there a new message that had just come in, a "text message box appears". Now, then the message would be opened on clicking. It will then disappears to the inbox once read. If I go click "Text Messages", I will find that message in the inbox which is fine. I can therefore delete any message in the inbox.

The Problem Some of the messages will not be diverted into the inbox for some reasons I don't seem to gather. These though, when opened, will just show a symbol (smiley, etc.) but without any text. The symbol will appear at the extreme right.