Thanks for reaching out. As the first troubleshooting step, can you please try to go to Roon Settings → Services → Qobuz → Edit → Log Out, then reboot your Roon Server, log back in, and let us know if this corrects the issue? Also just to clarify, you are able to see the correct number of tracks in the Qobuz native app and you are using the same email address in the Qobuz native app as you are in Roon, correct?
Translation:
I logged out of Qobuz from Roon, restarted the Roon server, started Roon, and logged in to Qobuz again. After that, the number of songs increased to 372081.
I was unable to find out the number of songs on Qobuz because it is not explicitly displayed. The email address is different between Roon and Qobuz. When I tried to set it to the same email address as Roon, I was told that the + symbol cannot be used and that I could not change it.