Why is the checkout amount less than the listed product price?

[wscandlestore]

Hello, I've notice that during checkout the amount paid differ from the amount i have listed for my products, My Gift Baskets i have listed for $49.99, but at checkout Shopify only charges the customer $47.72, also my $17.99 Candles  is being sold for $17.17 at checkout, can someone please explain what's going on here??