What you changed is a Track and its associated Recording. But since each tracklist/Medium have their own sets of Track names separate from the Recording names, changes to the Recording do not propagate to all the Tracks the Recording is associated with.
E.g., if a Release has "Awesome Track (single version)" listed on the track lasting, the Recording might only be called "Awesome Track" (maybe with "single version" as disambiguation).
So if you want all Tracks to have the fixed question mark, you need to fix every Release using the Recording. Note however that Release where the question mark is inside the parenthesis on the cover's track listing should maybe also be listed like that in MusicBrainz.
(Sorry if this is all too technical. Maybe someone can explain it in a simple manner. )