Compose Key continues with its original behavior.

[Rainbs]

I deactivated the option "Maintain original key behavior" but it still the same, I tried to add "Right ALT" as compose key, but it still not working, then I tried with "Menu", "F12" and a lot of different keys, but it still not working. It's weird because it was working perfectly with "Right ALT", but suddenly it started to do the original key behavior.