It depends on source format if JDownloader has to download the audio+video file(mp4) and then demux the audio stream or audio is available as seperate stream. In your case the audio stream got demuxed from video(mp4). so it first has to download the video and then demux the audio and then smaller filesize is shown in list. this is normal and only depends on selected format/variant
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JD-Dev & Server-Admin
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