Ah, that bullshit! I think you stumbled on the way Robinhood makes money. When I first joined the Android beta Robinhood had a very clear message before every

Ah, that bullshit! I think you stumbled on the way Robinhood makes money. When I first joined the Android beta Robinhood had a very clear message before every purchase: "to protect the user from volatility, Robinhood creates market orders as limit orders with a 5% higher price". So, yeah, that means that if you place your market order at $100, they reserve the right to broker it all the way to $105, which is bullshit. On average it won't be that high, but still, if you were planning to make a 0.5% profit, you'll always lose. The only way to get around that is by creating a proper limit order yourself, setting the price a couple cents the current price (to match the BP you are willing to give up.) Since I started doing that, things became way more predictable.