Adobe Captivate 7 - Audio files are written in chambers in the library - reason and effects?

Hello,

What could be the reason for this: imported audiofiles in the library are suddenly written in a chamber while working on a project? I did not change the location of this audio files after importing them to Adobe Captivate 7...so that possible lost link couldn't be the reason I suspect.

Do this representation with chambers has an effect e.g. after exporting and so on? I could not notice an effect so far....

Thanks for your answer,

Erika