Audiofiles grow from 4GB to 50GB after export

Hi Fredo, thanks for the answer.

Is there any way to make Nuendo only export the selected tracks AND only the 4GB that are shown in Audiopool?
Strange thing is: in the original project it says in Audiopool: 4454 Audiofiles, 4,88 GB. After exporting via export/selected tracks, the new audio file (media) consists of 4454 Audiofiles too, but weights 50GB now…??
Is that really normal?

Also, if Nuendo would normally export the whole original Audio file, how come the new audio file is “only” 50Gb not 80GB?

Am I completely misunderstanding something here?

Thanks for your help!