Hypothetical results?

I’m fairly new to C2 so not sure if this issue has been addressed before. Yesterday I noticed one of my autotrade signals was rejected by my broker. This trade was for a short position in an IPO stock offering. After research, I discovered that this signal could have never been a valid trade. The system developer confirmed this. However, the trade still shows up in the system’s closed trade log and, since it would have resulted in healthy profit, it certainly helps boost the monthly results for that system. Unfortunately its bogus.

My question is… how many trades get through to C2 and remain on the books that could never execute in real life? I understand that C2 posts “hypothetical” results but does that mean to include trades that are not even possible? How can I trust my investment money and monthly subscription fees to systems with potentially questionable statistics.