@AndyDandy: JDownloader only decompress archives after download when supported archive format and you have setup JDownloader to do so (default yes). By default JDownloader doesn't delete the archive parts but you can change that in Settings->Archive Extractor ->"Delete Archive Files..." and "Delete Archive download links.."
Either you're adding the non compressed and compressed version of your files or, more likely, you download the compressed version and JDownloader does auto extract it but keep (default) the archive as well. Just change the settings as described. If you don't want to auto decompress, just disable Settings->Archive Extractor, upper right corner or via archive level via rightclick context menu
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JD-Dev & Server-Admin
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