Because it's the real number. Every broker does this and they can't misrepresent the market or your account. The issue is that some people don't understand how

Because it's the real number. Every broker does this and they can't misrepresent the market or your account. The issue is that some people don't understand how option trades work, in this case a credit spread with 2 legs of a trade. One side was exercised and would have been offset by the other side when the broker got around to it, but it's not incorrect data. It's up to the trader to understand their trades.