You seem to have Discord’s auto-update enabled. But it can’t update itself when installed from the package manager:
- It would need superuser privileges to do so.
- It would create a conflict with the files provided by the package.
https://archived.forum.manjaro.org/t/discord-refuses-to-update-with-yay/157372/6
Personally, i use webcord instead, as that one doesn’t block you because of a pending update.