Amazon FBA sending my products back one by one after requesting it?

Based in the UK and new to selling on Amazon.

Started off in July selling some cosmetics that unfortunately a few days ago realised the expiry dates on some were expiring a lot quicker than I’d realised, and without knowing which was which, decided to pull them all off sale and have them shipped back to me.

There’s about 80 individual lip balms approximately, to which yesterday I received one back through the post. Today received another three individual parcels back.

I was hoping Amazon would return these in one large box? It just seems like such a waste sending these back individually, and quite hard work for my postman?

Is this normal? Or have I done something wrong when I’ve requested the products back?