this happened to me. i guess they forgot to include the course when they were transferring them over, idk? anyway, I only discovered this after I was accepted into my program- the school called me. I ended up having to directly send them my official transcript from where I took the course. I know we all panic and want everything to be perfect with our apps but schools are pretty cool about helping you out if something doesn't go right.
edit: just realized from above maybe you haven't sent out your apps- i agree with what they said, you should call. but still remain calm bc this did happen to me too.