Hi, I am facing this isuue that out of teh two legs of the vertical spready bull put option, only one of them is exercised om the expiration date. And after this date no trade happens. This seems like a bug to me. Please guide on how to fix the issue or have a workaround.

I have tried to liquidate all assets, and that one doesn't work either. In the example below only 170818P00237000 (buy put) is exercised on expiration, and not the sell put.