Hi there @Gunte, sorry to hear about this.
Can you please provide some additional information about the issue at hand so that we can assist further?
Do you see the same set of files both on your Android device and your computer?
Also, what is the desktop app's exact status as shown in your system tray/menu bar at the moment? Is it 'up to date' or still syncing?
Let me know what you find and we'll take it from there.