Funds can go missing on Robinhood for a few reasons: an issue with the link between your Robinhood account and bank account, a reverse split stock, a one-time system error, or a duplicate account was created by mistake. If you join Robinhood Gold and trade on margin, you can also lose money. You are borrowing money from the broker to trade. If your trades go south, your account will have a negative balance and you will owe Robinhood money.