Desktop app features are inconsistent with the web app
Usually, the web version is ahead of the desktop app by around a week. By checking in the main menu - "About", you can see if you're on the latest version of the desktop app.
It takes more work to release a new desktop version, plus releasing a desktop version requires all desktop app users to download the new version. Because of this, we only release a new desktop app when the current web version has been shown to be stable.