Fantasy Finance replicates the real world, which is why you may see that some of your trades are only partially filled. Here’s how it works:
In some markets, especially cryptocurrencies, very low trading activity (or volume) can occur. When this happens, the scarcity of finding matching buyers and sellers means the prices can go wild. But this is nothing to worry about! It’s simply following the basic law of supply and demand where the difference between what a buyer and a seller is willing to pay (the bid and ask price) will widen when demand is low, and more closely match when demand is greatest.
In the real world of trading, brokers try to match orders in full, but sometimes can only find a limited number of takers.