Indeed, the problem is that the fast food is mapped once as a node and once on the building outline.

In general, mapping POI (restaurants, shops, associations…) as nodes is better.

The problem was created in this changeset, 6 years ago (https://www.openstreetmap.org/changeset/58210423), by a his-and-run user who changed 77 buildings on her first edit and never came back.  That user is probably not active anymore, so we’ll have to clean up ourselves.

I have a To-Do list of bad changesets to review, I’ll add it.