@dce I see, that is very strange and worrying indeed. Are you running Insync or any other Google Drive syncing client on more than one machine? Could it have been due to activity on a different machine?
What you can do in this case is to delete the unwanted duplicates from Drive web, and then move the uploading folders out of your Insync directory. This will stop the re-uploading. Then, you can restore the original folders from the Drive Bin. Note that this will however necessitate re-downloading them if you want to keep them synced to your machine (otherwise, you can choose to selectively unsync them, which will keep them on Drive but not download them to your machine).
In order for us to look at the root cause of this issue, would you mind sending in your logs ( How to find the log files ) to support@insynchq.com?