Smelly Eurostar coach 5?

Today I travelled in Eurostar coach number 5. It is one of the smart coaches because it’s next to the bar and because every seat has a power plug. However, to my surprise, after the first 25 minutes it started smelling food. Popcorn, pizza… fast food kind of smell. It crossed my mind that this coach is “behind” the bar when going from London to Paris, I wonder if that could explain the food fragrance. But I never experienced this in coach 14, which is also “behind” when going from Paris to London. Funny.