Help me understand why Robinhood shows $70,700, buys at 70,050, and sells at 71,200?

I've traded insignificant amounts of BTC on Robinhood and noticed when I sold this morning, the price on the chart showed around $70,700. But when I go to sell, I can only sell for 70,050, while I can only buy for 71,200.

That's like a 1% difference from what I expect from what i see on the price, and a 2% loss if I bought and sold at the same time.