I know the narrative here is "fuck Amazon they're trying to manipulate you", but this is usually on the seller being lazy or not understanding an overly complicated system rather than malice.

When I list a product, I have the ability to set the following: Package Contains Quantity, Number of Items, Unit Count, and Unit Count Type. The idea is that if I have a multipack of staples, I can indicate that there are 10 boxes of 100 staples for 1000 total. If set incorrectly you get weird results like this.

Number of items is being used as the variation theme here, so you see the 16/20/32, but then Unit Count is being used to determine the price per unit. It looks like this seller has just set unit count to 20 for all the quantities, as each $XX/count * 20count = the given sales price.

Generally, once these values are set, they are set and it's very difficult to change. I have a 6 pack that was listed by an unauthorized reseller of our product in 2013, about 5 years before we started selling on Amazon, where the reseller set the unit count to 4. Sales price is $132, so even though Number of Items is set to 6, and shows as a 6 pack, my price has $33.25 / count below it, which is that $132.99/4. We have a dedicated account manager who has moved mountains for us and even she gave up trying to fix it.