Hi OldAdamUser2. I found and fixed a bug in version 0.8.9 that caused a similar effect, but it was triggered by longish (140+ character) filenames. Are any of your filenames that long? Version 0.9.0 or later will have the long filename fix. However, your problem may be from a different source.
If you can tell me anything more specific about the steps that trigger this weird behavior so I can reproduce and hopefully fix the problem, I would appreciate it very much. In this situation, if you close and re-open Fluff, is the list back to normal? Is it only happening in hour home directory, or only if you copy things in a certain way?
Update: Also, did you try "Refresh" (F5) when this happened before? Did it clear up the multiple entries? Or next time it happens, would you try that and see if it clears it up?