BV's overall profit margin has been struggling in the last several quarters, and that casts a huge contrast to other brands (ie. Gucci, Saint Laurent, etc.) under the Kering group, so it's understandable to see such massive reductions.
Balenciaga, Gucci and Saint Laurent are three Kering brands enjoying the most extensive profit growth since changes of their creative directors respectively. Gucci only reserves its sale exclusively for VIPs these days.