Hi,
you added the new tag "gtfs:stop_id:Malo Agglo Transports" here. In general keys should not contain any spaces.

If you look at the list of other gtfs tags you can see that the more usual scheme is slightly different:
https://taginfo.openstreetmap.org/keys/gtfs%3Astop_id#similar

The tag should contain a country code (to make clear where this tag is in use and to prevent duplicate tags across the world, followed by an abbreviated name or acronym.
So here I'd suggest to use

gtfs:stop_id:FR:MAT