Why did some of my paper trading orders show as filled after the close?

IBKR offers a simulated trading account to clients called a Paper trading account. Paper trading lets you use the full range of trading facilities in a simulated environment using real market conditions. Use this test environment to learn trading features such as order types without risk, learn market dynamics in new exchanges and products, and simulate and test trading strategies…

When you sign up for an IMPACT or Global Trader account, you also automatically receive a "paper" trading account. This account provides simulated trading funded with $10,000 of paper money. Choose whether you want to log into your live or paper account using the…

A paper trading account is a simulated account trading in a simulated market. IBKR programmatically simulates, to the best possible abilities, actual market conditions. However, it is not a real market, and in some instances prices may not exactly match. IBKR is simulating not only the trader’s functionality and the market, but also the role of the exchange. In a real, live account, the order would be sent to the exchange, and the exchange would be doing the execution—not IBKR…

There is no free trial account available for IBKR Lite. Once you have opened an IBKR Lite account, you would be eligible to open a paper trading account…