Not a bug…
the hosted version (https://app.plex.tv/desktop) is always the latest release available – this is where you can e.g. test the latest features such as the new dashboard. The version bundled with the local install of your Plex Media Server tends to be a few releases behind (stable).
You can keep track of the different releases in the Announcements
category of this forum (including release notes):
- Plex Web – latest version as of today is 3.85.2
- Plex Media Server – latest version as of today is 1.15.0.659 (beta version available to Plex Pass members); this version of PMS bundles Plex Web 3.77.4 (added to the local installs with PMS version 1.14.1)