See answer here
https://www.openstreetmap.org/note/2516189

There is one bus stop on each side of the street.
Sometimes, the same bus stop is served by several operators, namely STIB/MIVB and De Lijn.  It has proper tags for each company.
You might see two stops on the southern bank for the moment; once tiles are refreshed this problem will be gone.  This is not a data problem.