"Ghosting" problems

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Hi!

My Kindle Fire have started(or always but I haven't noticed) to keep old items that are closed on the screen.

For example, if I start Opera and browse around for a few minutes you can still see the menu bar on the homescreen. Not very well but with 90% transparancy or so. It stays there for 30-200 seconds. What I have noticed these ghosting things are only (or at leat more appearent)at the edges of the screen.

Could this be a software error or is it guaranteed a hardware failure in the screen. That would be really lame..

By the way, I'm running CM7 by JackpotClavin. Can't remember exactly which version, it has got the sound and it's not the latest.

Thanks for the future answers