Costco has deceptive trade practices when it comes to online orders

I placed an order on my wife's iPhone for Same Day delivery. Great.

I kept looking for a delivery fee or tip for the driver during checkout and Costco didn't say shit about either one. Odd but ok

After we get our order Costco sends a text to my wife's phone saying review order, tip driver, etc. Great we tip after delivery so we tip

Then we checked the receipt and they already charged us $4.92 for the tip. Fucking bullshit