Not all Albums shown. Tagged classical music

[AmBaKlaRo]

Thanks again. With DS Audio on Android I select Composer - a composer [here Sarasate] - and then see all the works including all the albums "Zigeunerweisen". See screenshots.
Using the PC browser on the NAS, I select AudioStation - Composer - one composer [Sarasate] - accordingly and get the same result. All albums [Album Tag] are displayed, including all "Zigeunerweisen".