Paypal change their payment process fee: https://www.fool.com/investing/2021/06/24/why-paypal-raised-processing-fees-coul...
Doing the math, you got charge 5.5 times which lead to the 19% + $2.6 in new paypal fees instead of the 15% + $1.65 in old paypal fees. A 4% + $1 difference in earnings. So yes paypal is individually counting the bulk request.