Why am I being overcharged on my Advanced Shopify plan?

[LKLewd]

I'm currently with the advanced plan so credit card fees should be 2.4% + $0.30. A customer placed an order using Shop Pay with Visa for $60.98 ($50.99 product + $9.99 shipping). I ended being charged $2.31. Isn't this charge about 3.3% + $0.30?