It is the same of my case , I sent my application in July and my husband got rejected to enter US in august , CIC returned the file in September because I missed to submit one documentation , I was rushing and resubmitted my application without mentioned about the refusal in August . They contacted me in last June to ask about that and Why I hide this information , I responded to them that I missed to update his form in that regard and it wasn't intentionally.
Although I passed in Medical and paid RPRP under their request from the last June , I am still under the second review because of this situation. I hope they can believe me that I didn't hide it intentionally.