I noticed that in some products the supposed minimum order quantity discount is not applied.
I have two cases open in this regard for more than three months and they are forwarded weekly to “experts” but are never answered. (It seems they don’t know how to solve it and they keep forwarding it)
I noticed this on zero VAT products.
FBA fee discount for minimum order quantity:
https://sellercentral.amazon.co.uk/help/hub/reference/GQUKGPW8TWBEUL94?ref=nslp_at_G2YVM3MQNGYDTDNR_en-GB_nslnk_1
Have you checked whether the alleged quantity discount is actually being applied to your product?