Comment 1 for bug 1885362

Thank you for taking the time to report this bug and helping to make Ubuntu better.

This bug potentially sounds like it is an issue with the discover calculations rather than flatpak, but let's check the sizes first.

Assuming that you have effectively just installed org.telegram.desktop org.kde.Platform//5.14 this would be 348.2MB of download, as shown below. (note there are some extra extensions such as org.freedesktop.Platform.GL.default//19.08, org.freedesktop.Platform.VAAPI.Intel//19.08 etc that could have also been installed - but these would only add another 93.8MB). However if such extensions are being installed, maybe discover isn't taking these into account?

Could you check which flatpak's you have installed ? And if possible the history of when they were installed? eg with $ flatpak list and $ flatpak history

It could also be possible that while you were installing the flatpak's another service performed network downloads such as unattended-upgrades or snap refreshes etc.

Therefore until there is more info as to which flatpak packages were installed, I am going to mark this bug as incomplete.

$ flatpak remote-info flathub org.telegram.desktop

Telegram Desktop - Telegram Desktop messenger

        ID: org.telegram.desktop
       Ref: app/org.telegram.desktop/x86_64/stable
      Arch: x86_64
    Branch: stable
   Version: 2.1.13
   License: GPL-3.0
Collection: org.flathub.Stable
  Download: 23.7 MB
 Installed: 49.4 MB
   Runtime: org.kde.Platform/x86_64/5.14

       Sdk: org.kde.Sdk/x86_64/5.14
    Commit: 134bf1b199a333c599e6d65b59568e4d1761c508f591adfa6dd9d18a0b620413
    Parent: 0f2b9e677e59d83228fee400209534437a4a10883dda8214fbf3126eeb011a0d
   Subject: Update to 2.1.13 (1a9a9b86)
      Date: 2020-06-24 10:26:24 +0000

$ flatpak remote-info flathub org.kde.Platform//5.14

KDE Application Platform - Shared libraries used by KDE applications

        ID: org.kde.Platform
       Ref: runtime/org.kde.Platform/x86_64/5.14
      Arch: x86_64
    Branch: 5.14
   License: GPL-2.0+
Collection: org.flathub.Stable
  Download: 324.5 MB
 Installed: 925.8 MB

    Commit: b2c33a73a8090ae9ab4a9802f9a26c6016b96f4e593ba577cb58483c85fa1345
    Parent: 710b312bd61bc199b086b0a82ea483b39f4aeeec4920bc1d8b655efa3f81c752
   Subject: build of org.kde.Sdk, Thu May 28 12:48:22 UTC 2020 (a0d676f934717ac697de659dcf92b838014dfe25)
      Date: 2020-05-28 20:11:47 +0000